Allen-Bradley 1771-IBN High True Input Module is a 32-point DC input module for 1771 I/O backplanes used in PLC-5 systems, and it accepts 10–30 VDC signals. The High True designation indicates a sink input configuration that requires a sourcing (positive) signal on each channel to register a true state, organized as four banks of eight inputs. The module draws about 280 mA from the backplane and uses the 1771-WN wiring arm for field wiring, providing a compact means to read digital 10–30 VDC signals from industrial devices.
