The Allen-Bradley / Rockwell Automation 1771-IBN 10...60V DC sink (source load) Digital Input Module houses 32 (4 sets of 8) inputs. Operating voltage for 1771IBN is 10...30V. Off-state current max. for this input module is 1.7mA and backplane current load is 280mA. Wiring arm is the 1771-WN. 1771-IBN is compatible with source switching devices, including: dry-contact switches, electro-mechanical transmitters, and panel switching devices.