Siemens FDCI221 Input Module (1 Input)

The Siemens FDCI221 is an addressable single-input module designed to monitor potential-free contacts and integrate external technical signals into a fire detection system. Communicating via FDnet/C-NET loops, this compact interface module monitors external equipment status such as sprinkler flow switches, door contacts, and technical alarm signals for seamless reporting to the main fire control panel. Its single input channel is continuously supervised for open and short-circuit faults, while an integral line separator maintains uninterrupted loop functionality in the event of wiring faults. Featuring automatic soft-addressing, low current consumption, and onboard LED status indication, the FDCI221 delivers reliable status monitoring in a compact, protected form factor.