Tighten the retaining screw to make sure the module is held in the rack

Use an SELV (Safety Extra Low Voltage) AS-Interface power supply, with 30 VDC nominal voltage

Place a earth fault detection device upstream of the AC supply connected to the PLCs that disconnects this power supply source if an earth leakage is detected

Ensure, for PLCs connected to a DC power supply source, that the power supply placed upstream of the PLC is SELV

Use only AS-Interface certified products on the bus