General precautions for wiring
(Original Document)
General
The power supply to sensors and actuators need fast-blow fuses against overload or overvoltage.
For reasons of performance the auxiliary inputs of the module have a short response time. You must therefore make sure that there is enough self-sufficient supply to these inputs to ensure the module continues to operate correctly in the event of a short power break. It is recommended that you use a regulated supply to ensure more reliable response times from the actuators and sensors. The 0 V supply must be connected to the protective ground nearest to the supply module output.