1771-IBN PLC-5 Digital DC Input Module | Allen-Bradley

Configured for discrete signal acquisition in PLC-5 control networks, the Allen-Bradley 1771-IBN (1771-IBN Digital DC Input Module) provides direct physical/electrical execution. This hardware unit processes 32 DC input channels organized into four isolated sets of eight, utilizing a 10-60 VDC sink (source load) configuration to monitor field device logic states across the backplane bus.

Hardware Specifications

Profinet / EtherNet/IP Deterministic Networks

The 1771-IBN relies on backplane bus communication velocity to transmit input state changes to the PLC-5 processor. Given the 6 ms (+/- 2 ms) digital filter response time for "on" signals, users must account for these latency characteristics when configuring scan timing for high-speed logic sequences. I/O density scaling is managed by the 32-channel configuration; however, firmware flash compatibility must be validated against the specific PLC-5 backplane adapter revision to ensure accurate address mapping and data throughput consistency.

Frequently Asked Questions

Q: Is this module capable of hot-swapping?

A: No. The 1771 series modules are not designed for removal or insertion under power. The chassis must be de-energized to prevent damage to the backplane connector or internal logic components.

Q: Does the module require a specific wiring arm for installation?

A: Yes. The 1771-IBN utilizes the 1771-WN wiring arm for secure field signal termination. Ensure the wiring arm is correctly keyed and fully latched to the module before system power-up.

Field Installation Guidelines

• Chassis Mounting: Insert the module into any available slot within the 1771 I/O chassis. Align the module with the guide rails and ensure the backplane connector is fully seated.
• Signal Wiring: Connect DC input signals to the 1771-WN wiring arm. Adhere to the sink/source configuration requirements, ensuring the field device supply common is properly referenced to the module's DC common.
• Grounding: Maintain a clean earth ground connection for the I/O chassis to prevent common-mode noise from triggering false inputs or degrading the input sensitivity.
• Conformal Coating: This module is equipped with conformal coating for increased resistance to environmental contaminants. Ensure the module is handled with care to prevent cracking the coating during installation.