Operation Processing During Momentary Power Failure - Mitsubishi MELSEC-Q Series User Manual

3
SPECIFICATIONS

3.4.4 Operation processing during momentary power failure

The C Controller module detects a momentary stop when the input power supply voltage
supplied to the power supply module falls below the specified range.
On detection of a momentary stop, the C Controller module performs the following
operation processing.
(1) When momentary stop time is equal to or shorter than permissible
momentary stop time
When a momentary stop occurs, the output status is held and the operation stops.
After the power is restored, the error information is registered to the event history file.
(The initial time only)
(a) Confirmation of the number of detected momentary stops
(b) When the module recovers from momentary stop
(2) When power failure lasts longer than permissible momentary stop time
The C Controller module makes an initial start.
The same operation processing as the one for any of the following operations is
performed.
The C Controller module holds the number of detected momentary stops inside it.
The number of detected momentary stops can be confirmed by the
QBF_ReadStatusEx function.
The operation processing is resumed when the module recovers from the
momentary stop.
• Power-on of the C Controller module
• Reset operation by the RESET/SELECT switch
• Remote reset operation by the C Controller setting utility or QBF_Reset function
3.4.4 Operation processing during momentary power failure
3.4 Operation Processing
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