The module is a digital output module that is equipped with 4 opto-triac outputs using phase-angle control. L and N are fed to the module for zero-crossing detection.
The EP2338-0001 EtherCAT Box has eight digital channels that can each be operated as inputs or outputs. It is not necessary to configure whether a channel (pin 4 of the M8) is to be used as input or output; the input circuit is permanently connected internally to the output driver, so that a set output is automatically displayed in the input process image.