ALLEN BRADLEY 1771-IBDK Digital Input Module

The ALLEN BRADLEY 1771-IBDK, also cataloged as the 1771-IBDK Digital Input Module, operates as a dedicated hardware component for high-density signal acquisition within PLC-5 control networks.

Hardware Specifications

Profinet / EtherNet/IP Deterministic Networks

The 1771-IBDK module is engineered for integration into the legacy PLC-5 I/O chassis, supporting deterministic data throughput to the central processor. It monitors 16 discrete input points, converting field-level 10-30 VDC signals into digital data blocks for processing by the backplane bus. The module employs internal optical isolation to protect the backplane circuitry from field-side voltage transients. Given the conformal coating, this hardware is specifically qualified for installation in environments susceptible to moisture, corrosive gases, or conductive dust accumulation, maintaining physical signal integrity over extended operational cycles.

Frequently Asked Questions (FAQ)

Q: Is the 1771-IBDK module compatible with live insertion and removal (RIUP) in an energized PLC-5 chassis?

A: No. The 1771 series modules do not support Remote Insertion/Removal Under Power (RIUP). You must disconnect the chassis power supply before extracting or inserting the module to prevent electrical arcing and potential damage to the backplane connectors.

Q: Does the conformal coating on the 1771-IBDK affect wiring terminal torque requirements?

A: The conformal coating is applied to the PCB components and does not impact the mechanical terminal block assembly. Standard torque specifications for the 1771-series terminal blocks remain applicable; ensure secure connection to prevent resistance buildup.

Field Installation Guidelines

1. Power down the I/O rack prior to installation to prevent backplane short-circuits.

2. Insert the module into the designated slot, ensuring proper alignment with the backplane guide rails before applying pressure to seat the edge connector.

3. Tighten the top and bottom module-to-chassis screws to ensure grounding continuity between the module faceplate and the chassis frame.

4. Route field wiring away from high-voltage AC cables to minimize crosstalk on the 10-30 VDC input channels. Ensure the shield of any shielded field cable is terminated at the designated rack grounding bus, not the module terminal itself.