Bradley 1771-IBN/C (REV-C) is a 32-channel DC input module for PLC‑5 and compatible 1771 I/O chassis, offering a 10–30 V DC input range. It is a sink-input device, meaning each channel sinks current and requires a source output to energize, with on-card input filtering to limit transients. The module groups inputs into four banks of eight and draws about 280 mA from the backplane, making it suitable for reading discrete sensors and switches in legacy PLC‑5 systems and PLC‑5/15 configurations (Series B and later) in 1771 backplanes.
