The Allen-Bradley 1771-NC6, also cataloged as the 1771NC6 Analog Cable, operates as a dedicated hardware component for facilitating high-resolution signal transmission between analog I/O modules and their associated remote termination panels within 1771 PLC platforms.

Model Matrix

• 1771-NC6: Standard catalog number for the 6 ft (1.83 m) interface cable.

• Application: Designated for 1771 series analog module signal routing.

Hardware Specifications

PLC System Integration and Signal Integrity

This cable assembly is engineered to maintain high-resolution analog signal integrity across the interconnection between the field-mounted termination panel and the I/O rack. In Allen-Bradley 1771 environments, maintaining strict adherence to cabling standards is required to ensure deterministic data transfer and accurate I/O density scaling. The cable assembly provides the necessary shielding to prevent signal degradation caused by backplane bus communication noise, ensuring that the analog values processed by the module remain within specified accuracy tolerances during module operations.

Ordering Information

• 1771-NC6 Analog Cable (6 ft).

• Includes factory-terminated connectors compatible with 1771 analog modules and termination panels.

• Note: Verify connector pinout compatibility with the specific 1771 analog module revision before deployment.

Field Installation Guidelines

• Routing: Install cable away from high-voltage AC lines and VFD output cables to minimize electromagnetic interference (EMI).

• Connection: Ensure all connector thumbscrews or locking mechanisms are fully engaged to provide a low-resistance contact patch.

• Bending Radius: Maintain a minimum bending radius equivalent to at least 10 times the cable diameter to prevent mechanical fatigue of the internal conductors.

• Shielding: Ensure the cable shield is properly terminated at the grounding point provided on the termination panel to maintain reference potential.

Frequently Asked Questions

• Does this cable support hot-swapping of modules? No, analog modules should be de-energized or the system placed in program mode before disconnecting cables to prevent transient voltage damage to inputs.

• Is the cable length field-modifiable? No, cutting or splicing the cable will compromise the high-resolution signal shielding and impedance characteristics.

• Can this cable be used with digital I/O modules? No, the cable is engineered specifically for analog signal characteristics and may not provide the necessary impedance matching for digital signals.

• How do I identify if the cable is damaged? Physical insulation damage, intermittent signal readings, or localized heating are indicators that the cable assembly must be replaced.

• Is the connector orientation keyed? Yes, the connectors are keyed to prevent improper insertion; do not force the connector if resistance is encountered.

• Does this cable require periodic calibration? No, as a passive cable, it does not require calibration, but periodic continuity checks are recommended during maintenance cycles.

• Can it be used in high-vibration areas? Yes, provided the cable is supported with cable ties to prevent connector strain during operation.

• Are terminal block jumpers included? No, the cable provides the point-to-point connection only; jumpers must be managed at the termination panel level.