Allen-Bradley 1492-ACABLE025UD Pre-assembled I/O Cable

Configured for analog signal transmission in ControlLogix 1756 I/O wiring systems, the Allen-Bradley 1492-ACABLE025UD (1492-ACABLE025UD Pre-assembled I/O Cable) provides direct physical connection between Bulletin 1756 analogue I/O, RTD, and thermocouple input modules and terminal interface assemblies. The shielded 2.5 m cable assembly uses factory-terminated connectors to reduce field termination variance and maintain signal continuity across low-level analog circuits.

Hardware Specifications

EtherNet/IP and Control Wiring Noise Isolation

The cable assembly is intended for low-level analog signal routing associated with ControlLogix 1756 analog, RTD, and thermocouple modules. Shield continuity across the cable length reduces susceptibility to conducted electrical noise generated by adjacent motor feeders, VFD output cables, and switching power devices.

Factory-installed connector terminations maintain conductor mapping consistency between I/O modules and interface terminals. When used inside EtherNet/IP control cabinets, analog cable routing should remain physically separated from high-current network power conductors and relay switching circuits to reduce induced signal distortion on temperature and analog input channels.

Frequently Asked Questions

Q: Does the 1492-ACABLE025UD support hot-swapping during controller operation?
A: The cable itself is passive; however, connection or removal should follow the hot-swap limitations defined for the connected Bulletin 1756 I/O module and terminal assembly.

Q: Is the cable shield required to be grounded at both ends?
A: Analog signal cable shields are typically terminated to protective earth at one control cabinet reference point to reduce ground loop current circulation. Grounding practices should follow the associated 1756 module installation manual.

Q: Can this cable be used with standard digital I/O modules?
A: The specified application is for Bulletin 1756 analogue I/O, RTD, and thermocouple input modules. Connector pinout assignments may not match digital module wiring assemblies.

Field Installation Guidelines

• Route analog cable assemblies separately from motor output cables, contactor wiring, and AC power feeders.

• Maintain minimum bend radius during cabinet installation to prevent conductor stress near connector transitions.

• Verify connector locking hardware is fully engaged before energizing the I/O rack.

• Avoid routing thermocouple and RTD signal wiring in parallel with switching DC power conductors over extended distances.

• Inspect shield continuity and connector pin integrity before commissioning low-level analog measurement loops.