5-9
Wiring system
Isolate the wiring systems to the control unit, input/output devices, and mechanical power apparatus.
Measures regarding power supply sequence (start up sequence)
• The power supply sequence should be set up so that power to the control unit is turned off before the
input/output power supplies.
• If the input/output power supplies are turned off before the power to the control unit, the control unit will
detect the input fluctuations and may begin an unscheduled operation.
• Be sure to supply power to a control unit and an expansion unit from the same power supply, and turn
the power on and off simultaneousl for both.
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