System components: Digital input module SFC420

The module simulates 8 discrete inputs through the use of pushbutton switches. It can also be used as a set of regular keys. The pushbuttons can be used to interact with the logic of the program or in the "debugging" process for verification of functionality and optimization. In order to feed conventional analog, discrete and pulse signals into the control system and to provide facilities for controlling valves, starters, pumps, switches etc., a number of local I/O modules can be added to the Field Controller rack assembly. The modules are addressed by means of a channel number in a special Field Controller hardware transducer block and, depending upon type and function, connected to the fielbus system by means of multiple or standard input and output blocks. Depending upon I/O type, an Analog or Discrete Multiple function block provides a connection for up to 16 input or output signals.

For more information on System components: Digital input module SFC420 talk to Endress+Hauser Ltd