78
between 10 and 25 ms (between 2 and 5 ms for a DC Power Supply), the inter-
ruption may or may not be detected. If the supply voltage drops below 85% of the
rated voltage for longer that 25 ms (less for the DC Power Supply), the PC will
stop operating and the external outputs will be automatically turned OFF.
Operation is resumed automatically when the voltage is restored to more than
85% of the rated value. The diagram below shows the timing of PC operation
and stopping during a power interruption. The time it takes to detect the power
failure is shorter when the power supply is DC. Also, the voltage value for which
the C200HX/HG/HE will stop due to a drop in the power supply voltage will be
lower than that for AC.
Power supply
Power
interrupted
Power
restored
Power failure detection signal
+5 V
CPU Unit operating voltage
Power supply reset
Time lapse until
detection
Wiring
Section 3-2
