1492-CABLE025N3 | Allen-Bradley | Digital I/O Module Ready Cable

The Allen-Bradley 1492-CABLE025N3, also cataloged as the 1492-CABLE025N3 Digital I/O Cable, operates as a dedicated hardware component for signal interconnection and point-to-point wiring transmission within Programmable Logic Controller (PLC) systems.

Hardware Specifications

PLC and Drives: Profinet / EtherNet/IP Deterministic Networks

This cable assembly is engineered to maintain signal integrity for high-density I/O modules, supporting the deterministic data exchange required by PLC platforms. The 40-conductor construction provides the necessary physical paths for discrete I/O signal transmission. While the assembly is a passive component, its mechanical impedance and electrical resistance properties are calibrated for interface compatibility with the 1746-N3 connector standard. Users must ensure that the cable is routed in accordance with proper electromagnetic compatibility (EMC) practices to avoid crosstalk or signal degradation between adjacent discrete channels.

Frequently Asked Questions (FAQ)

Q: Can this cable be shortened without impacting signal transmission?

A: Cutting the cable to shorten it is not recommended as it will compromise the factory-molded 1746-N3 connector termination. Modification of the cable assembly will negate the specified electrical characteristics and physical shielding integrity.

Q: Is this cable suitable for use in high-vibration environments?

A: The cable is designed for standard industrial cabinet environments. If installed in areas subject to significant vibration, ensure that the cable is secured with strain relief at both the PLC module end and the field terminal block end to prevent stress on the pins.

Field Installation Guidelines

• Cable Routing: Maintain a minimum separation distance of 50 mm from high-voltage AC power lines and variable frequency drive output cables to prevent electromagnetic noise induction into the discrete signal paths.

• Strain Relief: Ensure the cable is supported near the 1746-N3 connector to prevent mechanical tension from causing intermittent contact on the module interface pins.

• Connector Engagement: Align the 1746-N3 connector pins carefully before insertion. Do not apply excessive lateral force, as this can bend the pins within the PLC module header, leading to permanent hardware damage.

• Environment: Ensure the ambient operating environment remains within the rated specifications for the connected PLC module. Avoid exposure to oils, corrosive atmospheres, or localized heat sources that may degrade the cable insulation jacket.