18
Structure and Operation
Section 1-3
1,2,3...
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.
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.
85% of rated voltage
Program execution
CPU reset signal
Detection of
power interruption
Executing
Stopped
1. Minimum time
2. Additional
time
CPU Board operation
will continue if voltage is
restored in this region.
CPU Board operation
may continue if voltage
is restored in this region.
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