SMC Networks ex250-sen1 Operation Manual page 15

Connecting one or two power supplies to SI Unit
Both of single power supply and two power supply systems can be adopted, however, the wiring should be
made separately (for solenoid valves/output and for input and control) for both systems.
A. Two power supplies
B. Single power supply
3. Ground terminal
Connect the ground terminal to ground.
Resistance to ground should be 100 ohms or less.
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No.EX##-OMK0004-A