Siemens FDCIO221 Input/Output Module (1 Input and 1 Output)

The Siemens FDCIO221 is an addressable single-channel input/output module designed to monitor potential-free contacts and control auxiliary fire safety equipment. Operating on FDnet/C-NET communication loops, this compact module integrates 1 monitored input and 1 potential-free relay output to connect devices such as sprinkler flow switches, door release mechanisms, smoke dampers, and ventilation controls directly to the fire panel. Its input line is continuously supervised for open and short-circuit faults, while the relay output provides reliable switching for external systems. Equipped with an integral line separator to protect the loop against wiring faults, automatic soft-addressing, and onboard LED status indication, the FDCIO221 delivers efficient and dependable building automation control within a fire detection network.