Do your outputs will slightly glow when off?

Improperly connected commons on sinking and sourcing PLC output transistors can cause voltage to “leak” by. Sourcing PLC outputs require a connection to both the +24VDC and the 0V of your power supply. If you do not connect the 0V, then the PLC output will slightly glow due to leakage current.

Let’s take a few minutes to understand why and figure out how to fix this.