The ability to perform diagnostic functions must remain in every operating mode. This is an extremely important aspect of operational safety for the entire machine. That is why the power supply for I/O is completely separate from communication on the X67 system. Even if the I/O supply is interrupted, communication and diagnosis capabilities remain. Flexible system supply modules are used for this purpose. A system supply module can provide power to two lines. Any number of system supply modules can be used in an X67 installation, allowing maximum availability by implementing a redundant supply design.

The total separation of the power supply from the communication and I/O makes it possible to safely turn off all outputs in the power circuit with an E-stop switching device. Communication continues to take place. The X67 system has been certified and approved by a German occupational safety and health commission up to the highest category, Category 4, in accordance with DIN EN 954-1.