NAiS FP Series User Manual page 59

Installation and Wiring
Wiring system
Isolate the wiring systems to the control unit, input/output devices, and mechanical
power apparatus.
Circuit breaker
Figure 36: FPΣ Power supply wiring system
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 simultaneously for both.
5 - 10
Mechanical
power
apparatus
Input/Output
devices
Control unit
Insulated DC
power supply
FPΣ