Description
- Manufacturer: Allen-Bradley (Rockwell Automation)
- Part Number: 1771-IBDB
- Product Line: PLC-5 Universal I/O System
- Number of Inputs: 16 Isolated Inputs
- Voltage Category: 12-24V DC Sink/Source
- Operating Voltage: 10-30V DC
- Signal Delay: 1ms (on to off), 1ms (off to on)
- Input Current: 12mA @ 24V DC
- Isolation: 1500V RMS Field-to-Backplane / 500V DC Channel-to-Channel
- Backplane Current: 300mA @ 5V DC
- Compatible Wiring Arm: 1771-WN
- Logic State: Low-True (Inputs are active when the circuit is closed to the return)

Allen Bradley 1771-IBDB

Allen Bradley 1771-IBDB

Allen Bradley 1771-IBDB
The ALLEN-BRADLEY 1771-IBDB is a high-reliability isolated digital input module designed for legacy PLC-5 systems to interface with 24V DC field devices. Its channel-to-channel isolation allows for the safe monitoring of inputs from multiple power sources or distinct grounding points, preventing ground loop interference and protecting the backplane from electrical noise. This module is frequently utilized in harsh industrial environments where electrical separation between field sensors and the central processing unit is a critical safety and performance requirement.
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