Omron SYSMAC CPM2B Operation Manual page 36

Structure and Operation
1,2,3...
18
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1. Minimum power interruption detection time
Power interruptions that are shorter than 2 ms will not be detected.
2. Undetermined additional time
Power interruptions only slightly longer than the minimum power interrup-
tion time may not be detected.
85% of rated voltage
Program execution
CPU reset signal
Note If the power supply voltage fluctuates around 85% of the PLC's rated voltage,
PLC operation may stop and restart repeatedly. When repeated stopping and
starting will cause problems with the controlled system, set up a protective cir-
cuit such as a circuit that shuts off the power supply to sensitive equipment
until the power supply voltage returns to the rated value.
Detection of
power interruption
1. Minimum time 2. Additional
time
Executing Stopped
CPU Board operation CPU Board operation
will continue if voltage is may continue if voltage
restored in this region. is restored in this region.
Section 1-3