Tag Archive for: Industrial Connector

Push-Pull vs Threaded Circular Connectors: Which Performs Better in Repeated Mating

Circular connectors are widely used in industrial automation, robotics, medical devices, test equipment, and communication systems because they provide reliable electrical connections in demanding environments.

Two of the most common locking mechanisms are push-pull and threaded connectors. Both offer excellent electrical performance, but they are designed for different operating priorities.

When connectors are frequently connected and disconnected during equipment maintenance, tool changes, or production testing, the locking mechanism becomes just as important as the electrical specifications.

This article compares push-pull and threaded circular connectors from the perspective of repeated mating performance, helping engineers choose the right solution for long-term reliability.

Understanding the Two Locking Mechanisms

Although both connector types perform the same basic function, their locking principles are very different.

Push-Pull Connectors

Push-pull connectors automatically lock when inserted and can be released with a simple pull on the outer sleeve.

Key characteristics include:

One-handed operation
Automatic self-locking
Fast connection and disconnection
Compact structure
Reduced installation time

They are commonly used in:

Collaborative robots
Medical devices
Test equipment
Portable instruments
High-end industrial automation

Threaded Circular Connectors

Threaded connectors use screw threads to mechanically secure the connection.

Key characteristics include:

High locking force
Excellent vibration resistance
Reliable mechanical stability
Proven industrial performance

Typical applications include:

Servo motors
Machine tools
Heavy industrial equipment
Outdoor automation
Mobile machinery

Repeated Mating Performance

Repeated insertion and extraction gradually wear connector contacts and locking mechanisms.

For applications requiring frequent maintenance or module replacement, engineers should consider:

Mating cycle life
Ease of operation
Contact stability
Mechanical wear

Push-pull connectors are generally designed for rapid, repeatable operation with minimal handling effort.

Threaded connectors remain highly durable but require additional time to tighten and loosen during each connection cycle.

Maintenance Efficiency

Maintenance time directly affects production uptime.

Push-Pull Advantages

Because no threading is required, push-pull connectors allow technicians to:

Connect faster
Disconnect quickly
Operate with one hand
Reduce maintenance time
Lower the risk of improper tightening

These advantages are especially valuable in automated production lines where minimizing downtime is critical.

Threaded Connector Considerations

Threaded connectors require several turns to fully engage or disengage.

While this provides excellent mechanical security, it can increase maintenance time in applications with frequent connector changes.

Vibration Resistance

Industrial environments often expose connectors to continuous vibration and mechanical shock.

Threaded connectors have long been recognized for their strong vibration resistance due to their secure mechanical engagement.

Modern push-pull connectors, however, incorporate advanced self-locking mechanisms that provide reliable resistance to accidental disconnection while enabling much faster operation.

The choice depends on both the vibration level and maintenance frequency of the application.

Ergonomics and Operator Experience

Connector usability becomes increasingly important when operators repeatedly perform connection tasks.

Push-pull connectors offer several ergonomic benefits:

Reduced hand fatigue
Faster operation
Intuitive locking
Consistent mating force

Threaded connectors may require additional torque, particularly when connectors are installed in confined spaces.

Durability and Mating Cycles

Both connector types can achieve long service lives when properly designed.

Typical performance factors include:

Contact material
Gold plating thickness
Spring design
Housing material
Manufacturing precision

High-quality push-pull connectors are commonly designed for 5,000 or more mating cycles, making them well suited for applications involving frequent reconnection.

Threaded connectors also provide excellent durability, particularly in installations where connectors remain mated for extended periods.

How FPIC Supports High-Reliability Connector Solutions

FPIC develops push-pull self-locking connectors, circular connectors, and customized connector solutions for robotics, medical equipment, industrial automation, and testing systems.

Our push-pull connector series combines fast mating, secure locking, high-quality gold-plated contacts, and long mating life to help customers improve maintenance efficiency without compromising reliability. Backed by more than 23 years of manufacturing experience, FPIC supports projects from prototype development through high-volume production.

Final Thoughts

Push-pull and threaded circular connectors both provide reliable electrical connections, but they excel in different environments.

For applications involving frequent mating cycles, rapid maintenance, and operator convenience, push-pull connectors often deliver significant productivity advantages.

For heavy-duty environments where maximum mechanical retention is the priority, threaded connectors remain an excellent choice.

Understanding the operating environment, maintenance requirements, and expected mating frequency is the key to selecting the most suitable connector.

FAQ

Are push-pull connectors suitable for industrial automation?

Yes. Modern push-pull connectors are widely used in industrial automation, robotics, and medical equipment because they combine secure locking with fast connection and disconnection.

Which connector type is better for repeated mating?

Push-pull connectors are generally better suited for applications requiring frequent connection cycles because they reduce operating time and simplify maintenance.

Are threaded connectors more resistant to vibration?

Threaded connectors typically provide excellent vibration resistance through their mechanical screw-locking design, making them ideal for heavy industrial applications.

How many mating cycles can a push-pull connector withstand?

High-quality push-pull connectors are commonly designed for 5,000 or more mating cycles, depending on the connector series and operating conditions.

How should engineers choose between push-pull and threaded connectors?

The decision should be based on maintenance frequency, vibration level, available installation space, required mating speed, and overall application requirements.

Looking for High-Performance Push-Pull and Circular Connectors?

Whether your application requires rapid repeated mating or maximum mechanical retention, FPIC provides high-quality push-pull self-locking connectors and circular connectors engineered for robotics, industrial automation, medical equipment, and precision instrumentation. Our engineering team can help you select the right connector solution to improve reliability, simplify maintenance, and support long-term performance.

Contact FPIC today to discuss your connector application.

Resources

IEC 61076 – Connectors for Electrical and Electronic Equipment
https://webstore.iec.ch/
Provides international standards covering the design, performance, and testing of circular and industrial connectors.
IEC 60512 – Connectors for Electronic Equipment – Tests and Measurements
https://webstore.iec.ch/
Specifies standardized mechanical, electrical, and environmental test methods, including connector durability and mating cycle evaluations.
LEMO – Push-Pull Connector Technology
https://www.lemo.com/
Introduces the principles, advantages, and applications of push-pull self-latching connector systems.
ODU – Circular Connector Solutions
https://www.odu-connectors.com/
Provides technical resources on high-cycle mating connectors for medical, industrial, and testing applications.
TE Connectivity – Circular Industrial Connectors
https://www.te.com/
Offers guidance on connector selection, durability, vibration resistance, and industrial interconnect solutions.

July 16, 2026/by FPIC

Engineering & Testing, News

Circular Connector Shield Termination: Common Mistakes That Hurt EMC Performance

As industrial automation systems continue to adopt high-speed communication protocols such as Industrial Ethernet, EtherCAT, PROFINET, and CAN Bus, electromagnetic compatibility (EMC) has become an essential part of circular connector design.

While engineers often focus on cable shielding, one critical detail is frequently overlooked—the shield termination inside the connector.

A high-quality shielded cable can still perform poorly if the shield is improperly terminated. In many EMC failures, the connector itself is not the problem; rather, it is the way the shield is connected.

This article explains the most common shield termination mistakes found in circular connectors and provides practical recommendations for improving EMC performance.

What Is Shield Termination?

Shield termination refers to the method used to electrically connect the cable shield to the connector housing or grounding system.

Its purpose is to:

Maintain shield continuity
Minimize electromagnetic emissions
Improve immunity against external interference
Provide a low-impedance path for high-frequency noise

A properly terminated shield allows electromagnetic energy to flow safely to ground instead of coupling into nearby signal conductors.

Why Shield Termination Matters

Modern industrial equipment contains numerous EMI sources, including:

Servo drives
Frequency inverters
Switching power supplies
Industrial Ethernet
High-speed digital communication
High-current power cables

Without effective shield termination, these noise sources may result in:

Communication failures
Packet loss
Encoder errors
Sensor instability
Unexpected equipment shutdown

Proper shield termination is often the difference between passing and failing EMC testing.

Common Mistake #1: Pigtail Grounding

One of the most common installation mistakes is connecting the shield through a long drain wire or “pigtail.”

Although convenient, this creates additional inductance that significantly reduces shielding effectiveness at high frequencies.

Recommended practice:

Avoid long pigtails.
Use direct 360° shield termination whenever possible.

Common Mistake #2: Incomplete 360° Shield Contact

Some connectors only contact a small portion of the cable braid.

This creates gaps in the shielding path and allows electromagnetic energy to leak.

Good shield termination should provide:

Full circumferential contact
Uniform pressure
Continuous metal-to-metal connection

Complete 360° termination offers substantially better EMC performance.

Common Mistake #3: Poor Shield Continuity

The shield should remain electrically continuous from one connector to the other.

Common problems include:

Broken braid
Damaged foil
Poor crimping
Loose shield clamps
Oxidized metal surfaces

Even small discontinuities may reduce shielding effectiveness.

Common Mistake #4: Incorrect Grounding Strategy

Shield grounding depends on system architecture.

Single-end grounding may reduce low-frequency ground loops.

Dual-end grounding generally provides better high-frequency EMC performance.

The appropriate strategy should be selected according to:

Operating frequency
Equipment layout
Grounding system
EMC requirements

There is no universal solution for every application.

Common Mistake #5: Ignoring Connector Housing Material

Plastic connector shells provide little shielding capability.

For demanding industrial environments, engineers often prefer:

Metal circular connectors
Conductive connector shells
Nickel-plated housings
Aluminum alloy housings

Metal housings improve overall shielding continuity and EMC performance.

Selecting Connectors for High EMC Applications

When selecting circular connectors for robotics, industrial automation, or energy storage systems, engineers should evaluate:

360° shield termination
Metal housing
Shield continuity
Contact resistance
IP protection level
Vibration resistance
Mating cycle durability

Connector performance should be evaluated as part of the complete cable assembly rather than as an individual component.

Verifying Shield Performance

Proper shield termination should be validated through testing.

Typical evaluations include:

Shield continuity measurement
Contact resistance testing
Radiated emission testing
Conducted emission testing
EMC immunity testing
High-frequency impedance measurement
Cable flex testing

Laboratory verification ensures consistent EMC performance before production.

Industry Standards

Shielded circular connectors commonly reference:

IEC 61000 Series — Electromagnetic Compatibility (EMC)
IEC 61076 Series — Connectors for Electronic Equipment
CISPR 11 — Industrial Equipment Emissions
CISPR 32 — Multimedia Equipment EMC Requirements
IEC 60512 — Connector Mechanical and Electrical Tests

Compliance with these standards helps ensure reliable operation in industrial environments.

How FPIC Supports EMC Connector Solutions

FPIC develops circular connectors, push-pull self-locking connectors, and customized connector assemblies for industrial automation, robotics, medical devices, and energy storage applications.

Our engineering team focuses on optimized shield termination, reliable connector grounding, and robust mechanical design to help customers achieve stable signal transmission and improved EMC performance in demanding environments.

Final Thoughts

Shield termination is one of the most important—but often overlooked—factors affecting connector EMC performance.

Even the highest-quality shielded cable cannot compensate for poor connector termination.

By using proper 360° shield termination, maintaining continuous shielding, selecting appropriate connector materials, and validating EMC performance, engineers can significantly improve communication reliability and reduce electromagnetic interference.

As industrial communication speeds continue to increase, connector shield termination will play an even greater role in system performance.

FAQ

What is shield termination in a circular connector?

Shield termination is the electrical connection between the cable shield and the connector housing or grounding system, providing a controlled path for electromagnetic noise.

Why is a 360° shield termination better than a pigtail?

A 360° termination minimizes high-frequency impedance and provides continuous shielding around the cable, while pigtails introduce inductance that reduces EMC performance.

Do metal connector housings improve EMC?

Yes. Metal housings help maintain shield continuity and provide better electromagnetic shielding than plastic housings.

Should cable shields be grounded at one end or both ends?

The best grounding method depends on operating frequency, grounding architecture, and EMC requirements. High-frequency applications often benefit from dual-end grounding.

How is shield termination verified?

Common tests include shield continuity, contact resistance, EMC emissions, immunity testing, and high-frequency performance evaluation.

Looking for High-Performance Shielded Circular Connectors?

Reliable EMC performance begins with proper connector design. FPIC provides shielded circular connectors, push-pull self-locking connectors, and custom connector solutions engineered for industrial automation, robotics, medical equipment, and energy storage systems. Our engineering team supports customers with optimized shielding, connector integration, and reliable manufacturing for demanding applications.

Contact FPIC today to discuss your EMC connector requirements.

Resources

IEC 61000 Series – Electromagnetic Compatibility (EMC)
https://webstore.iec.ch/
International EMC standards covering electromagnetic emissions, immunity, and grounding practices.
IEC 61076 Series – Connectors for Electrical and Electronic Equipment
https://webstore.iec.ch/
Provides international standards for the design, testing, and performance of circular and industrial connectors.
IEC 60512 – Connectors for Electronic Equipment – Tests and Measurements
https://webstore.iec.ch/
Specifies mechanical, electrical, and environmental test methods for connector assemblies.
Phoenix Contact – EMC Connection Technology
https://www.phoenixcontact.com/
Explains shield termination, grounding concepts, and EMC best practices for industrial connectors.
TE Connectivity – EMC Shielding Solutions for Industrial Connectivity
https://www.te.com/
Provides technical guidance on connector shielding, 360° shield termination, and high-speed industrial communication.

July 10, 2026/by FPIC

News, Selection Guides

Connector Selection for Robotics: Locking, Shielding and Cable Exit Considerations

Industrial robots operate in demanding environments where connectors are exposed to constant motion, vibration, electromagnetic interference (EMI), and frequent maintenance. While much attention is often given to servo motors and robot controllers, connector selection is equally important for ensuring reliable power delivery and stable signal transmission.

A poorly selected connector can loosen under vibration, introduce communication errors, restrict cable movement, or shorten cable life. Choosing the right connector requires more than matching the voltage and current ratings—it involves evaluating the complete operating environment.

This article explains the key considerations when selecting connectors for robotic systems, focusing on locking mechanisms, EMC shielding, cable exit orientation, and long-term durability.

Why Connector Selection Matters in Robotics

Unlike stationary industrial equipment, robotic systems perform continuous multi-axis movements that repeatedly bend, twist, and accelerate cables.

Connectors must therefore withstand:

Continuous vibration
Frequent movement
Mechanical shock
Electromagnetic interference
Repeated mating cycles
Limited installation space

Connector reliability directly influences machine uptime and maintenance costs.

Choosing the Right Locking Mechanism

One of the most critical connector features is the locking system.

A connector that loosens during robot operation can interrupt power or communication, causing unexpected machine stops.

Common locking mechanisms include:

Threaded Locking

Advantages:

Excellent vibration resistance
High mechanical strength
Suitable for industrial automation

Applications:

Servo motors
Industrial robots
Machine tools

Push-Pull Locking

Advantages:

Quick connection and disconnection
Secure automatic locking
Compact design
Fast maintenance

Applications:

Collaborative robots (Cobots)
Medical robots
Inspection equipment
Automated production lines

Bayonet Locking

Advantages:

Fast quarter-turn locking
Good vibration performance
Reliable positioning

Applications:

Mobile robots
Outdoor equipment
Industrial machinery

Selecting the locking method should balance installation efficiency with vibration resistance.

Why Shielding Is Essential

Modern robots contain numerous high-speed electrical devices, including:

Servo drives
Frequency converters
Industrial Ethernet
Encoders
Vision systems

These devices generate electromagnetic interference that may affect communication signals.

Shielded connectors help:

Reduce EMI
Improve signal integrity
Lower communication errors
Support high-speed data transmission

Proper shield continuity between cable and connector is essential for achieving effective EMC performance.

Selecting the Best Cable Exit Direction

Cable exit orientation is often overlooked during connector selection.

However, it directly affects cable stress and available installation space.

Typical exit options include:

Straight Exit

Best for:

Open installation space
Linear cable routing
Easy assembly

Right-Angle Exit

Best for:

Compact robot joints
Tight cabinet layouts
Reduced bending stress
Improved cable management

Proper cable exit selection helps extend cable flex life and minimizes mechanical strain near the connector.

Environmental Protection Requirements

Robots frequently operate in challenging environments.

Connector selection should consider:

Dust
Water spray
Oil
Coolant
Metal particles
Cleaning chemicals

Depending on the application, connectors may require:

IP67 protection
IP68 protection
IP69K protection

Environmental sealing improves long-term reliability and reduces maintenance frequency.

Connector Durability and Mating Cycles

Industrial robots often require periodic replacement of end effectors or tooling.

Frequent connection and disconnection demand connectors with long mating life.

Typical industrial requirements include:

More than 500 insertion cycles
2,000–5,000 cycles for automation equipment
Higher durability for collaborative robots and testing equipment

Gold-plated contacts further improve contact stability and corrosion resistance.

Size and Weight Considerations

As robots become smaller and faster, connector size becomes increasingly important.

Compact connectors provide:

Lower moving mass
Improved joint flexibility
Easier cable routing
Better space utilization

Miniaturization is especially important in collaborative robots and precision automation equipment.

Validation Before Deployment

Connectors should be validated under realistic operating conditions.

Recommended tests include:

Vibration testing
Mechanical shock testing
Cable flex testing
Salt spray testing
Contact resistance measurement
Insertion and extraction force testing
EMC verification
Environmental sealing tests

System-level validation provides the highest confidence in connector performance.

How FPIC Supports Robotics Connector Solutions

FPIC develops high-performance connector solutions for industrial automation, robotics, and intelligent manufacturing.

Our product portfolio includes push-pull self-locking connectors, circular connectors, waterproof connectors, and customized connector assemblies designed for demanding robotic applications. With over 23 years of manufacturing experience, FPIC supports customers from rapid prototyping through mass production, providing reliable connectivity solutions that improve equipment uptime and long-term performance.

Final Thoughts

Selecting the right connector for robotic applications involves much more than matching electrical specifications.

Locking mechanisms, shielding performance, cable exit orientation, environmental protection, and durability all influence system reliability.

As robotic systems continue to become faster, smarter, and more compact, connector design plays an increasingly important role in maintaining stable operation and reducing maintenance costs.

FAQ

Why are locking connectors important in robotics?

Locking mechanisms prevent accidental disconnection caused by vibration, motion, or mechanical shock, improving system reliability.

When should shielded connectors be used?

Shielded connectors are recommended whenever high-speed communication or servo systems operate in environments with significant electromagnetic interference.

Which cable exit is better, straight or right-angle?

It depends on available space and cable routing. Right-angle exits are often preferred in compact robot joints to reduce bending stress.

What IP rating is recommended for industrial robots?

Many industrial robots require IP67 protection, while washdown or outdoor applications may require IP68 or IP69K connectors.

How are robotics connectors validated?

Typical validation includes vibration, cable flex, EMC, sealing, mating cycle, and contact resistance testing.

Looking for Reliable Connectors for Robotics and Industrial Automation?

FPIC provides high-performance connector solutions for industrial robots, collaborative robots, servo systems, and automated equipment. From push-pull self-locking connectors to waterproof circular connectors, our engineering team helps customers select the right connectivity solution for demanding motion applications.

Contact FPIC today to discuss your robotics connector requirements.

Resources

IEC 60529 – Degrees of Protection Provided by Enclosures (IP Code)
https://webstore.iec.ch/
Defines IP ratings such as IP67, IP68, and IP69K for connector protection against dust and water ingress.
IEC 61076 – Connectors for Electrical and Electronic Equipment
https://webstore.iec.ch/
International standards covering the design, performance, and testing of industrial connectors.
ODVA – EtherNet/IP Physical Layer and Industrial Connectivity
https://www.odva.org/
Provides technical guidance on industrial Ethernet connectivity and connector performance in automation systems.
TE Connectivity – Industrial Robotics Connectivity Solutions
https://www.te.com/
Explains connector technologies, shielding solutions, and rugged interconnect systems for robotics and automation.
Phoenix Contact – Connectors for Industrial Automation
https://www.phoenixcontact.com/
Offers technical resources on circular connectors, EMC protection, and reliable industrial connectivity.

July 10, 2026/by FPIC

Engineering & Testing, News

IP67 vs IP68 vs IP69K Connectors: What the Ratings Really Mean in Field Use

When selecting industrial connectors, one of the first specifications engineers notice is the IP rating. Products are commonly advertised as IP67, IP68, or IP69K, often implying that a higher number automatically means better protection.

However, this assumption is not always correct.

Each protection level is designed for different environmental conditions, and choosing the wrong rating can either reduce equipment reliability or unnecessarily increase product cost.

This article explains what IP67, IP68, and IP69K ratings actually mean, how they are tested, and how engineers should interpret these ratings in real-world applications.

Understanding the IP Rating System

The Ingress Protection (IP) rating is defined by IEC 60529, an international standard used to classify the degree of protection provided by electrical enclosures against solid particles and liquids.

An IP rating consists of two digits.

The first digit indicates protection against solid objects and dust.
The second digit indicates protection against water.

For industrial connectors, the first digit is commonly 6, representing complete protection against dust ingress.

The primary difference between IP67, IP68, and IP69K lies in their resistance to water under different conditions.

What Does IP67 Mean?

IP67 is one of the most common protection ratings used in industrial automation.

A connector meeting IP67 requirements must:

Be completely dust-tight (IP6X)
Withstand temporary immersion in water up to 1 meter for 30 minutes

Typical Applications

IP67 connectors are commonly used in:

Industrial automation equipment
Sensors
Factory machinery
AGVs
Warehouse automation
Outdoor lighting

What IP67 Does Not Mean

One common misconception is that IP67 connectors are suitable for continuous underwater operation.

In reality, IP67 is designed for temporary immersion only. Continuous submersion may eventually compromise the sealing system unless the connector is specifically designed for that environment.

What Does IP68 Mean?

IP68 provides protection against continuous immersion.

Unlike IP67, IEC 60529 does not specify a fixed immersion depth or duration.

Instead, the manufacturer defines the test conditions.

Typical examples include:

2 meters for 24 hours
5 meters for 48 hours
Other application-specific requirements

Because of this flexibility, two IP68 connectors may have significantly different underwater performance.

Typical Applications

IP68 connectors are often selected for:

Marine equipment
Underground monitoring systems
Water treatment facilities
Outdoor telecommunications
Renewable energy systems

When comparing IP68 products, engineers should always verify the manufacturer’s immersion specifications rather than relying solely on the IP rating.

What Does IP69K Mean?

IP69K addresses a completely different challenge.

Instead of prolonged immersion, IP69K evaluates resistance to high-pressure, high-temperature water jets.

During testing, connectors are exposed to:

Water temperatures up to 80°C
Pressures around 80–100 bar
Spray angles of 0°, 30°, 60°, and 90°
Rotating spray conditions

The objective is to verify sealing performance during aggressive cleaning processes.

Typical Applications

IP69K connectors are widely used in:

Food processing equipment
Beverage production
Pharmaceutical manufacturing
Agricultural machinery
Construction equipment
Commercial vehicles

Frequent washdown environments often require IP69K rather than IP68.

IP67 vs IP68 vs IP69K: A Practical Comparison

Feature	IP67	IP68	IP69K
Dust Protection	Yes	Yes	Yes
Temporary Water Immersion	✔	✔	Not primary purpose
Continuous Submersion	Limited	✔	Not designed for this
High-Pressure Washdown	✖	Limited	✔
High-Temperature Cleaning	✖	✖	✔

The table shows that none of these ratings is universally “better.” Each addresses a different environmental challenge.

Common Misconceptions About IP Ratings

Higher IP Ratings Are Not Always Better

Selecting IP69K for a machine that only requires occasional rain exposure may increase cost without providing additional practical benefits.

Conversely, using IP67 in a high-pressure washdown environment may result in premature seal failure.

IP68 Is Not a Universal Underwater Rating

Because manufacturers define immersion conditions, engineers should always request the specific IP68 test parameters.

Connector Design Matters

Even when connectors share the same IP rating, long-term field performance depends on factors such as:

sealing materials
connector locking mechanism
cable gland quality
installation practices
maintenance procedures

Proper installation is just as important as connector selection.

Additional Factors Beyond the IP Rating

An IP rating only evaluates protection against dust and water.

Industrial connector selection should also consider:

vibration resistance
operating temperature
UV resistance
chemical compatibility
mating cycle life
corrosion resistance
EMC shielding

In harsh environments, these characteristics often determine connector reliability more than the IP rating itself.

Validation in Real Applications

Field validation should include tests that reflect actual operating conditions.

Typical validation activities include:

water immersion testing
pressure wash testing
thermal cycling
vibration testing
salt spray testing
connector durability testing
sealing inspection after repeated mating cycles

Laboratory certification alone does not guarantee long-term field reliability.

How FPIC Supports Sealed Connector Development

Selecting the correct protection level requires understanding the actual operating environment rather than simply choosing the highest IP rating.

FPIC develops custom connector and cable assembly solutions for industrial automation, robotics, energy storage, transportation, medical equipment, and harsh-environment applications. Our engineering team supports customers in selecting sealing structures, connector configurations, and validation methods that match real operating conditions while balancing performance, durability, and cost.

Final Thoughts

IP67, IP68, and IP69K are often misunderstood as progressive levels of waterproof performance.

In reality, each rating addresses different environmental conditions.

Understanding the testing methods behind these ratings allows engineers to make better connector selections, improve equipment reliability, and avoid unnecessary costs.

Rather than asking which rating is higher, the more important question is:

Which rating best matches the actual application?

FAQ

Is IP69K better than IP68?

Not necessarily. IP69K is designed for high-pressure, high-temperature washdown, while IP68 is intended for continuous water immersion.

Can an IP67 connector be used underwater?

Only for temporary immersion. Continuous underwater applications generally require a connector specifically qualified for IP68 conditions.

Does IP68 always mean the same immersion depth?

No. The immersion depth and duration are defined by the manufacturer and should always be verified.

Are IP69K connectors also dustproof?

Yes. Like IP67 and IP68, IP69K connectors provide complete protection against dust ingress.

What other factors should be considered besides IP ratings?

Engineers should also evaluate vibration resistance, temperature range, UV resistance, chemical compatibility, mating cycle life, and corrosion resistance.

Looking for Reliable Sealed Connector Solutions?

Choosing the right IP rating is only one part of connector selection. FPIC provides custom sealed connectors and cable assemblies engineered for demanding industrial environments, helping customers improve equipment reliability while avoiding unnecessary design costs.

Contact FPIC today to discuss your application requirements.

Resources

IEC 60529 – Degrees of Protection Provided by Enclosures (IP Code): Defines the international IP rating system, including IP67 and IP68 test requirements.
ISO 20653 – Road Vehicles – Degrees of Protection (IP Code): Specifies IP69K testing methods for high-pressure, high-temperature water jet protection used in automotive and industrial applications.
Phoenix Contact – IP Protection Classes Explained: Explains how IP ratings apply to industrial connectors and highlights practical selection considerations.
TE Connectivity – Sealed Connector Solutions: Discusses sealing technologies, environmental performance, and connector selection for harsh environments.
UL Solutions – Environmental Testing Services: Provides an overview of environmental validation methods, including water ingress, thermal cycling, and durability testing.

June 26, 2026/by FPIC

Application Insights, News

Single Pair Ethernet Connectors in Industrial Automation: What to Watch in 2026

Industrial automation networks are entering a new phase of connectivity.

For decades, factory communication systems have relied on:

Fieldbus networks
Industrial Ethernet
M8 and M12 connectors
RJ45 interfaces
Multi-pair communication cables

Today, Single Pair Ethernet (SPE) is emerging as one of the most important technologies supporting Industry 4.0, IIoT, and smart manufacturing initiatives.

While SPE has been discussed for several years, 2026 is expected to be a significant milestone as more industrial equipment manufacturers move from pilot projects to commercial deployment.

For engineers, OEM buyers, and system integrators, understanding upcoming SPE connector trends can help guide future product and infrastructure decisions.

Why SPE Is Gaining Momentum

Industrial networks continue to evolve toward greater connectivity.

Factories now require:

more sensors
more data collection
more edge devices
more intelligent actuators

Traditional Ethernet remains effective, but many field-level devices do not require the size and complexity of four-pair Ethernet infrastructure.

Single Pair Ethernet offers:

reduced cable size
lighter harnesses
simplified installation
Ethernet-based communication down to the sensor level

This makes SPE highly attractive for next-generation automation architectures.

Trend #1: Increasing Adoption of IEC 63171 Connector Standards

One of the biggest developments to watch in 2026 is the growing acceptance of IEC 63171 connector standards.

These standards define connector interfaces for SPE applications.

Common variants include:

IEC 63171-2
IEC 63171-5
IEC 63171-6

As more automation suppliers adopt standardized interfaces, interoperability across equipment platforms is expected to improve.

For buyers, connector standard compatibility will become an increasingly important procurement criterion.

Trend #2: Expansion of SPE in Smart Sensors and Actuators

Many industrial sensors currently use:

discrete I/O
fieldbus interfaces
proprietary communication methods

SPE enables direct Ethernet connectivity to field devices.

Benefits include:

simplified architectures
real-time diagnostics
easier device integration
reduced gateway requirements

By 2026, more sensor and actuator manufacturers are expected to release SPE-enabled products.

Trend #3: Growth of Power over Data Line (PoDL)

Power over Data Line (PoDL) remains one of the most compelling SPE features.

PoDL allows:

data transmission
device power

through the same twisted pair.

Potential advantages include:

fewer cables
reduced installation costs
smaller harnesses
simplified device deployment

As SPE ecosystems mature, PoDL adoption is expected to accelerate across industrial automation markets.

Trend #4: Smaller and More Compact Industrial Devices

Machine builders continue to pursue:

smaller equipment footprints
higher device density
reduced cabinet space

SPE connectors support these goals through:

compact connector designs
reduced cable diameter
lighter cable assemblies

This trend is particularly important in:

robotics
machine vision
semiconductor equipment
compact automation cells

Connector miniaturization will remain a major development focus in 2026.

Trend #5: Stronger Focus on EMC Performance

As industrial networks become more data-driven, communication reliability becomes increasingly critical.

Industrial environments contain significant sources of electromagnetic interference:

servo drives
VFDs
motors
switching power supplies

Although SPE cables are smaller, EMC challenges remain.

Future SPE connector development will likely emphasize:

improved shielding
lower transfer impedance
optimized grounding
enhanced connector shielding continuity

EMC performance will continue to be a key differentiator among suppliers.

Trend #6: More SPE Solutions for Robotics

Robotic systems require communication solutions that can withstand:

continuous flexing
torsion
vibration

As robots become more connected, SPE presents an opportunity to simplify communication architectures.

However, robotic SPE cable assemblies must still address:

dynamic motion
shielding durability
flex life requirements

2026 may see a broader range of SPE products specifically designed for robotic applications.

Trend #7: Integration with Industry 4.0 Architectures

Industry 4.0 initiatives emphasize:

unified communication
real-time data access
device interoperability

SPE aligns closely with these goals.

Benefits include:

end-to-end Ethernet connectivity
simplified networking
easier data collection
scalable architectures

Many manufacturers view SPE as a foundational technology for future smart factories.

Trend #8: Growing Demand for Hybrid Connectivity Solutions

The transition to SPE will not happen overnight.

Many facilities will operate mixed environments including:

traditional Ethernet
fieldbus networks
SPE networks

As a result, demand is growing for:

SPE-to-Ethernet adapters
hybrid cable assemblies
migration-friendly connectivity solutions

Suppliers that support both legacy and emerging standards may have a competitive advantage.

Trend #9: Higher Expectations for IP Protection

Industrial users continue to demand robust environmental protection.

Common requirements include:

IP67

Factory automation equipment.

IP68

Harsh industrial environments.

IP69K

Washdown applications.

Future SPE connectors will need to maintain industrial-grade sealing despite smaller form factors.

Trend #10: Supplier Qualification Will Become More Important

As SPE adoption grows, buyers will increasingly evaluate suppliers based on:

connector standard compliance
EMC performance
environmental testing
manufacturing quality
application engineering support

Selecting the right connectivity partner may become as important as selecting the connector itself.

Challenges That Still Need Attention

Although SPE offers significant advantages, several challenges remain.

Standard Fragmentation

Multiple connector standards continue to coexist.

Ecosystem Maturity

Some industrial markets are still in the early adoption phase.

Infrastructure Transition

Existing Ethernet systems remain deeply established.

Education and Training

Many engineers are still learning SPE design principles.

These factors will influence adoption rates over the coming years.

Questions Buyers Should Ask in 2026

Before selecting SPE connector solutions, buyers should ask:

Which IEC 63171 standard is supported?
Is PoDL available?
What EMC testing has been completed?
What IP protection level is achieved?
Is the connector suitable for robotics or drag-chain applications?
What interoperability testing has been performed?
How does the supplier support future scalability?

Typical Applications Expected to Grow

SPE connectors are expected to expand across:

Smart sensors
Intelligent actuators
Industrial IoT devices
Edge computing equipment
Robotics
Machine vision systems
Process automation
Smart manufacturing platforms

How FPIC Supports Emerging SPE Connectivity Needs

FPIC develops advanced industrial connectivity solutions including:

SPE cable assemblies
Industrial Ethernet harnesses
M8 and M12 communication cables
Shielded data cable assemblies
Robotic communication harnesses
Custom overmolded connector solutions

Our engineering team helps customers evaluate emerging connectivity technologies while maintaining compatibility with current industrial infrastructure.

Final Thoughts

Single Pair Ethernet connectors are moving from concept to practical deployment.

In 2026, key developments are expected around:

IEC 63171 standard adoption
PoDL expansion
connector miniaturization
robotics integration
Industry 4.0 implementation
EMC optimization

For OEMs and industrial buyers, now is the time to understand SPE technologies and prepare for the next generation of industrial networking.

Organizations that evaluate SPE early may gain advantages in system simplification, scalability, and future connectivity readiness.

FAQ

What is a Single Pair Ethernet connector?

An SPE connector is a connector designed to transmit Ethernet communication through a single twisted pair of conductors.

What is PoDL?

Power over Data Line (PoDL) enables both power and data transmission over the same SPE cable.

Will SPE replace Industrial Ethernet?

Not immediately. SPE is expected to complement existing Ethernet infrastructure, particularly at the device level.

Which SPE connector standards are most important?

IEC 63171-2, IEC 63171-5, and IEC 63171-6 are among the most widely discussed industrial SPE connector standards.

Why is SPE important for Industry 4.0?

SPE enables direct Ethernet connectivity to sensors and actuators, supporting unified and scalable industrial communication architectures.

Planning for Next-Generation Industrial Connectivity?

FPIC provides custom SPE cable assemblies, Industrial Ethernet harnesses, M8/M12 connectivity solutions, and engineering support for automation, robotics, and Industrial IoT applications.

Contact us to discuss your future Single Pair Ethernet connectivity requirements.

Resources

IEC 63171 Series – Single Pair Ethernet Connector Standards
IEEE 802.3cg – 10BASE-T1L and 10BASE-T1S Standards
PROFIBUS & PROFINET International (PI) SPE Resources
ODVA Single Pair Ethernet Guidance
Phoenix Contact and HARTING SPE Technology Documentation

Source References: IEC 63171, IEEE 802.3cg, PI, ODVA, Phoenix Contact, HARTING SPE technical resources.

June 22, 2026/by FPIC

Application Insights, News

M12 X-Coded vs D-Coded vs A-Coded Connectors: Which One Fits Industrial Ethernet

M12 Connectors have become one of the most widely used connectivity solutions in industrial automation.

You’ll find them in:

PLC systems
Industrial Ethernet networks
Sensors and actuators
Machine vision equipment
Robotics
Servo drives
IIoT devices

However, one common misconception is that all M12 connectors are interchangeable.

In reality, X-coded, D-coded, and A-coded M12 connectors are designed for different purposes, and selecting the wrong type can lead to communication limitations, compatibility issues, or unnecessary costs.

This article explains the key differences and helps industrial buyers choose the right M12 connector for their application.

Understanding M12 Connector Coding

The coding of an M12 connector determines:

pin arrangement
electrical isolation
supported protocols
data transmission capability
application suitability

The coding prevents incompatible connectors from being accidentally mated.

Among the various M12 coding types, A-coded, D-coded, and X-coded are the most commonly encountered in industrial automation.

What Is an A-Coded M12 Connector?

A-coded connectors were originally developed for industrial sensors and actuators.

They are the most widely used M12 connector type.

Typical Applications

Proximity sensors
Photoelectric sensors
Solenoid valves
I/O modules
Power distribution
Basic field devices

Common Pin Counts

3-pin
4-pin
5-pin
8-pin
12-pin

Main Function

A-coded connectors primarily carry:

power signals
discrete I/O signals
analog signals

They are generally not intended for high-speed Ethernet communication.

What Is a D-Coded M12 Connector?

D-coded connectors were developed specifically for Industrial Ethernet applications.

Typical Applications

PROFINET
EtherNet/IP
Industrial switches
PLC communication
Machine networking

Ethernet Capability

D-coded connectors typically support:

Fast Ethernet
100 Mbps communication

Pin Configuration

D-coded connectors use:

4 contacts
2 twisted pairs

This configuration is optimized for industrial network communication.

What Is an X-Coded M12 Connector?

X-coded connectors were introduced to support higher Ethernet bandwidth requirements.

As Industry 4.0 and machine vision applications expanded, Fast Ethernet became insufficient for many systems.

Typical Applications

Gigabit Ethernet
Machine vision
Industrial cameras
High-speed data acquisition
Smart manufacturing equipment

Ethernet Capability

X-coded connectors support:

1 Gbps Ethernet
10 Gbps Ethernet (depending on system design)

Pin Configuration

X-coded connectors use:

8 contacts
4 twisted pairs

Internal shielding separates the pairs to improve EMC performance and reduce crosstalk.

Quick Comparison

Feature	A-Coded	D-Coded	X-Coded
Primary Use	Sensors & Power	Industrial Ethernet	High-Speed Ethernet
Typical Speed	Signal/Power	100 Mbps	1 Gbps+
Contact Count	3–12 Pins	4 Pins	8 Pins
Ethernet Support	Limited	Yes	Yes
Shielding Requirement	Low–Medium	High	Very High
Common Applications	Sensors, I/O	PLC Networks	Vision & Data Systems

Why X-Coded Is Becoming More Popular

Several trends are driving adoption of X-coded connectors:

Machine Vision Systems

Industrial cameras generate large amounts of data.

Gigabit Ethernet is often required.

Industry 4.0

Modern smart factories rely on:

real-time monitoring
edge computing
high-speed communication

Future-Proofing

Many OEMs choose X-coded solutions today to avoid future bandwidth limitations.

Why D-Coded Remains Relevant

Although X-coded connectors offer higher speeds, D-coded connectors remain widely used.

Reasons include:

lower cost
established PROFINET infrastructure
sufficient bandwidth for many automation systems
simpler network architectures

Many PLC and I/O networks do not require Gigabit Ethernet.

Why A-Coded Connectors Are Often Misunderstood

A common mistake is assuming that all M12 connectors can be used for Ethernet.

Many A-coded connectors physically resemble D-coded or X-coded versions.

However:

contact layouts differ
shielding requirements differ
communication capability differs

An A-coded connector should generally be viewed as a sensor, actuator, or power connector rather than an Ethernet connector.

Shielding Considerations

As data rates increase, EMC performance becomes more critical.

A-Coded

Typically used for power and signals.

Shielding requirements vary by application.

D-Coded

Requires shielded twisted pairs and proper grounding.

X-Coded

Requires:

advanced shielding
pair separation
360° shield termination
controlled impedance design

High-speed Ethernet performance depends heavily on shielding quality.

IP Ratings and Environmental Protection

All three connector types can be supplied with:

IP67 protection
IP68 protection
IP69K protection

The coding itself does not determine environmental sealing.

Protection level depends on connector design and assembly quality.

Connector Selection by Application

Choose A-Coded When:

✓ Connecting sensors

✓ Connecting actuators

✓ Transmitting power

✓ Handling standard I/O signals

Choose D-Coded When:

✓ Deploying PROFINET

✓ Using Fast Ethernet networks

✓ Connecting PLCs and switches

✓ Bandwidth requirements remain below Gigabit levels

Choose X-Coded When:

✓ Using Gigabit Ethernet

✓ Supporting machine vision systems

✓ Future-proofing network infrastructure

✓ Managing high-data applications

Common Buyer Mistakes

Selecting Based Only on Connector Appearance

M12 coding determines functionality.

Appearance alone can be misleading.

Overlooking Bandwidth Requirements

Future communication needs should be considered.

Ignoring Shielding Quality

High-speed communication requires robust EMC design.

Using A-Coded Connectors for Ethernet Applications

This can create communication failures and compatibility issues.

Focusing Only on IP Rating

Electrical performance is just as important as environmental protection.

Questions Buyers Should Ask Suppliers

Before selecting an M12 connector solution, ask:

What coding is used?
What Ethernet speed is supported?
Is the connector shielded?
Is 360° shield termination available?
What IP rating is achieved?
Is the assembly suitable for drag-chain applications?
Has EMC validation been completed?

Typical Applications

A-Coded

Sensors
Actuators
Field I/O

D-Coded

PROFINET
EtherNet/IP
Industrial networking

X-Coded

Machine vision
Industrial cameras
Gigabit Ethernet
Smart manufacturing

How FPIC Supports M12 Connectivity Solutions

FPIC provides custom industrial connectivity solutions including:

M12 A-coded cable assemblies
M12 D-coded Ethernet harnesses
M12 X-coded Gigabit Ethernet assemblies
Industrial Ethernet cable solutions
Drag-chain communication cables
Custom overmolded cable assemblies

Our engineering team helps customers select the most suitable connector architecture based on network performance, EMC requirements, and environmental conditions.

Final Thoughts

Choosing between A-coded, D-coded, and X-coded M12 connectors depends on the application.

While A-coded connectors remain ideal for sensors and power distribution, D-coded and X-coded connectors are purpose-built for Industrial Ethernet.

For modern automation systems, selecting the correct coding ensures:

network reliability
EMC performance
future scalability
long-term system compatibility

Understanding these differences helps buyers avoid costly design mistakes and improve industrial network performance.

FAQ

Can A-coded M12 connectors be used for Ethernet?

Generally no. A-coded connectors are primarily designed for sensors, actuators, and power transmission.

What is the difference between D-coded and X-coded M12 connectors?

D-coded connectors typically support Fast Ethernet (100 Mbps), while X-coded connectors support Gigabit Ethernet and higher-speed communication.

Which M12 connector is used for PROFINET?

D-coded connectors are commonly used for PROFINET networks, although X-coded versions are increasingly adopted for higher bandwidth applications.

Is X-coded better than D-coded?

Not necessarily. X-coded offers higher bandwidth, but D-coded may be more cost-effective for applications that only require 100 Mbps communication.

Do all M12 connector types support IP67?

Yes. A-coded, D-coded, and X-coded connectors can all be designed to meet IP67 or higher protection ratings.

Looking for Custom M12 Cable Assemblies?

FPIC provides M12 A-coded, D-coded, and X-coded cable assemblies for sensors, Industrial Ethernet, machine vision, robotics, and smart factory applications.

Contact us to discuss your M12 connectivity requirements.

Resources
IEC 61076-2-101 – M12 Connector Standards
IEC 61076-2-109 – M12 X-Coded Connector Standards
PROFINET Installation Guidelines
ODVA EtherNet/IP Infrastructure Guidance
Phoenix Contact Industrial Ethernet Connectivity Documentation
Source References: IEC 61076 Series, PROFIBUS & PROFINET International (PI), ODVA, Phoenix Contact Industrial Connectivity Resources.

June 22, 2026/by FPIC