Allen-Bradley 1771-IBD is a 16-point DC digital input module for the PLC-5 1771 I/O chassis, designed to read 10–30 V DC field signals. It provides 16 input channels, with per-input current draw of 4 mA at 10 V and 12 mA at 30 V and an input impedance of about 2.5 kΩ, while the backplane must supply up to 130 mA; total module power dissipation ranges from 1.3 W (min) to 6.0 W (max). The 1771-IBD features a propagation delay of approximately 1.3 ms and is compatible with Series B PLC-5 I/O racks.
