The digital input/output modules convert

• the level of the external digital signals from the process to the internal signal level of the controller and
• the internal signal level of the controller to the external signal level required by the process.

The SM 327 is an additional finely scalable IO module. It has a total of 16 channels, whereby 8 channels are permanently defined and a further 8 channels can be used individually as inputs or outputs. This hybrid module can therefore be flexibly implemented for any combinations.