I/O (input/output) modules used in computer-controlled systems in the process industry
Output modules are solid state relays which make it possible to control large powers from logic level The input modules adjust signals from e.g. a sensor to a suitable level for the electronics
These modules are made using thick film technology with opto-isolators which provide galvanic isolation
The modules are colour-coded according to a standard to avoid confusion and to facilitate replacement with other brands