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5.5.2 Momentary Power Failures
Operation of momentary power failures
•
If the duration of the power failure is less than 10 ms, the FP-XH M8N control unit continues
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to operate. If the power is off for 10 ms or longer, operation changes depending on the
combination of units, the power supply voltage, and other factors. (In some cases, operation
may be the same as that for a power supply reset.)
•
Although the duration of the power failure for the expansion FP0 adapter is 10 ms, judge
-
the permissible time for the system after confirming the permissible duration of the power
failure for the DC power supply that supplies power to the expansion FP0 adapter. (Supply
the power to it from the service power supply for the input of the FP-XH M8N control unit.)
•
When using the expansion unit with a built-in power supply (E30, expansion FP0 adapter),
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depending on the duration of the momentary power failure, either one unit may be without
electricity momentarily and the I/O verify error may occur. In that case, turn off the power
supply and then turn on again.
5.5.3 Watchdog Timer
• The watchdog timer detects abnormal program or hardware.
• When using the FP-XH M8N control unit, it is set to 640 ms.
• The ERR.LED at the front of the controller unit lights up after the watchdog timer is operated.
At this time, the output of all output units turned to OFF and brought to a standstill.
5.5 Safety Measures
5-15
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