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A-4
PLC Operation for Power
Interruptions
Overview of Operation for Power Interruptions
Power Supply Voltage Drop
If the power supply voltage falls below the specified value (85% of rated voltage) while the CPU Unit
is in RUN or MONITOR mode, operation will be stopped and all outputs will be turned OFF.
Detection of Momentary Power Interruptions
The system will continue to run if the momentary power interruption lasts less than 10 ms (2ms for
DC power supply). If power is interruped for longer than 10 ms (2ms for DC power supply), a
momentary power interruption will be detected or undetected. If the momentary power interruption is
detected, the CPU Unit will be stopped and outputs will be turned OFF.
Below 85% of rated voltage
0
Supply
voltage
Supply
voltage
Automatic Recovery
Operation is automatically restarted when the power supply voltage is restored.
CP1E CPU Unit Software User's Manual(W480)
10ms
0 to 10 ms max.
(0 to 2ms max. for
DC power supply)
Momentary power
interruption not detected
Operation continues
10 ms min.
(2ms min. for DC power supply)
Operation will continue or stop
depending on whether a
momentary power interruption
is detected.
Time
Appendices
A-85
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