Today, many industrial automation, robotics and machine control systems rely on custom sensor and actuator cables to create the nervous system. When designing custom sensor & actuator cables, proper cables with the right connector layout, core count, and signal mapping achieves consistent signal transmission, reduces downtime, and allows for easy integration with PLCs, drives, IO-Link devices, and robotic arms. Through our one-stop design and manufacturing capabilities, we can design and provide solutions specifically to address the unique needs of each application while satisfying rigorous performance and certification standards, all at Hulk Electric.
Low-quality cables are frequently poorly specified and result in connectors that don’t fit, interference from other equipment or early failures due to flexing, oil or EMC stress. Here you’ll find practical, step-by-step guidance from more than 20 years’ experience in manufacturing high-flex industrial cables, so you can take the time to specify a strong and reliable custom assembly.
Why Custom Sensor & Actuator Cables Need Structured Design
There are very few off-the-shelf solutions which are acceptable in an industrial environment. Machines differ with respect to their layout, motion cycles, environmental exposure and complexity of signals, with custom design being essential for optimal performance and longevity.
Beyond “Any Cable Fits” – Matching Cable to Application
Sensor and actuator cables need to be exactly matched with the device connectors, signal types, existing loads, path and operating conditions. If the cables are used in high cycle drag chain applications, or in close proximity to a variable frequency drive, the cable can be susceptible to conductor breaks, EMI problems or damaged jackets. These issues can be avoided and total cost of ownership can be minimized with proper design.
Custom Assemblies for OEMs and Projects
A lot of your OEMs and system integrators will need custom cables that are drawn, BOM or sample specific. A systematic connector selection and core configuration process, combined with pin mapping, speeds up the quoting, prototyping and production process, while providing full traceability and UL, CE, and other standard compliance.
Choosing Connector Families and Layouts
Compatibility, durability and installation are determined by what connectors you use.
Common Sensor/Actuator Connector Families
The M8 and M12 connectors are the most common connectors used in industrial sensor and actuator applications, and for good reason.The M8 and M12 connectors are the most widely used connectors for industrial sensor and actuator applications, and there’s a reason for that. The M5 is for ultra compact units and M23 is for higher power or multi-signal use. Hulk’s custom assemblies are compatible with all major families, and are strain relief and overmolded for reliability.
Pin Count and Pole Configurations
Choose the number of poles according to the device needs: 3-pole for simple sensors; 4- or 5-pole for additional power and/or data lines; higher (up to 8-pole in M12) for complex actuators and/or multiple signals. This separation is important to guarantee signal integrity and makes troubleshooting easier.
Connector Orientation and Mechanical Layout
Straight connectors are suitable for those places where space is not an issue, while the angled varieties are ideal for panels or moving equipment. Take direction of cable entry, accessibility for mating and mechanical stress into design.
Defining Core Count, Conductor Size and Cable Construction
Undersizing and oversizing is avoided by accurate electrical and mechanical specification.
Core Count from Signal Plan
For low currents, the typical signal cores are 0.14 – 0.34 mm², cross-section. For actuated power lines, the current may need to be carried in a larger cross sectional area (0.5-2.5 mm²) to maintain flexibility and carry current safely. Hulk’s high-flex stranding provides long life in dynamic applications.
Conductor Size for Signal vs Power
Use PVC for general indoor applications, PUR or TPE for oil resistance and flexibility, or shielded constructions will protect from EMI near motors or drives. The halogen-free and high-temperature options are available for challenging food, robotics and automation applications.
Jacket Material, Shielding and Environment
Choose PVC for standard indoor use, PUR or TPE for oil resistance and high flexibility, and shielded constructions near motors or drives to combat EMI. Our halogen-free and high-temperature options support demanding food, robotics, and automation environments.
Designing Connector Layout and Signal Mapping
Good documentation is the key to good custom cable projects.
Pinout Diagrams and Signal Naming
Draw in-depth diagram of a pinout that includes pin number, signal names (24V, GND, DI1, AI+, etc.), wire colors and direction. Standardized naming in schematics, labels and BOMs minimizes assembly and field installation mistakes.
Mapping Signals Across Multiple Connectors
Define 1:1 mapping for cables to IO modules or distribution boxes – include any required crossovers. M8 to M12 branches to trunks is a hub style design which simplifies panel wiring.
Shield Termination and Grounding
To prevent ground loops and preserve EMC performance, specify which connection points, on the device end, connector backshell, or panel, should be shielded. The correct termination is essential for noise-sensitive analog or fieldbus signals.
RFQ and BOM Information – What to Prepare for Custom Cables
When you communicate with your manufacturer, you get quicker and more precise quotes.
Technical Schedule – What Engineers Should Specify
Specify the type of cable, conductor sizes, number of conductors, type of shielding, jacket material, cable length, bend radius, environmental conditions, and cable connectors. Use devices and route diagrams where possible.
Commercial Details for Quotation
Communicate quantity, packaging (reel/box/ct-l), delivery dates and labeling needs. From raw materials to finished assemblies, we can track in every aspect of the process through the use of Hulk’s ERP system.
Documents and Samples
Provide wiring diagrams, connector part numbers, photos of existing wiring or physical samples of the wiring. This assists us in the perfect replication of markings, dimensions and performance.
Design and Manufacturing Best Practices for Custom Assemblies
DFM, Routing and Prototyping
Think manufacturability early on – minimum bend radius, connector OD, strain relief. We prototype quickly (7-day sampling) to test designs in actual environment.
Testing and Quality Requirements
Set Continuity, Insulation resistance, shielding effectiveness and functional tests. Extensive electrical and mechanical endurance testing is carried out in our in-house lab in accordance with UL, CE and customer requirements.
Labeling, Marking and Replacement
Match with existing cable marking for ease of maintenance. Good labelling constitutes less time spent in troubleshooting and replacing in the field.
Example Design Scenarios – Turning Requirements into Cable Designs
Multi-Core Machine-Side Cable for Valve and IO Modules
A 12-core PUR cable with M12 connectors could be connected to a 12-core valve bank application, with 24V power carried by larger cores, shielded pairs for analog feedback, and standard wires for discrete I/O — all mapped to ensure signal integrity over 10-meter runs, with repeated flexing.
Custom M12 Sensor Cable with Mixed Signals
For a proximity sensor cluster: 0.34 mm² cores with 24V, GND and 3 PNP signals for 5-pole M12. Noises in noisy drive environments are filtered out due to shielded construction and correct pin mapping.
Retrofits Matching Existing Cable Markings
Legacy equipment replacement cables need to be just the right length, with the correct orientation and printed markings. The use of photos and samples ensures accurate reproduction using better materials for a longer lifespan.
Checklist – Designing Custom Sensor & Actuator Cables
Connector and Layout Checks
- Connector family, pin count, orientation and gender are clearly specified and device-compatible?
- Mechanical constraints and pin numbering recorded?
Core Count, Conductor and Cable Construction
- Is the count of cores that includes spares?
- Sizes of conductors, jackets and shielding corresponding with electrical load and environment?
Signal Mapping, Documentation and Testing
- All parties know the complete pinouts and mappings?
- Test, labelling and maintenance requirements defined?
Choosing the optimal design specifications for custom sensor/actuator cable provides stable performance, reduced integration complexity and overall lower costs. Our high-flex, servo, robot and fieldbus cable experience enables us to provide you with the exact cable that you need with quick sample time, worldwide certification and consistent quality.
Let us know your parameters (device list, routing or existing samples) and our engineering team will provide you with optimized custom solutions to meet your automation needs.