Yokogawa Touch Screen GP20 User Manual Page 399

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App-23
IM 04L51B01-01EN
Appendix
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5
App
Appendix 5 Power Recovery Operation
This section explains how the GX/GP operates when it recovers from a power failure.
Power Failure Detection
The GX/GP power shuts down when the power is disrupted for the times indicated below.
100 to 240 VAC: 1 cycle or more
24 VDC/AC: 1 ms or more
Basic Operation
The following operations are retained when the GX/GP recovers from a power failure.
Recording Operation
If a power failure occurs while the GX/GP is recording, it will continue recording when it
recovers.
Display and event data files are separated when a power failure occurs.
Monitor Display
The monitor display is retained.
If a power failure occurs when a menu is showing, all unsaved settings are discarded,
and the monitor display returns.
Except for the following cases, trend waveforms continue from the end of waveforms
before the power failure.
When the file type is set to event data only
When the trend interval switching function is on
Moving Average
Moving average of AI channels are not retained. When the GX/GP recovers, a new moving
average will start.
Timer Action
Relative timer
Time action is retained. Relative timers do not count the power failure time.
Absolute timer, match time timer
If timers expire during a power failure, timeout processing occurs when the GX/GP
recovers.
Remote
Remote conditions are retained. If remote conditions change during a power failure, the
corresponding remote actions are executed when the GX/GP recovers.
Computation
If a power failure occurs while the GX/GP is computing, it will continue computing when it
recovers.
Computation results are retained during a power failure.
Rolling average values are also retained during a power failure.
If absolute timers or match time timers expire during a power failure, TLOG computation
is performed when the GX/GP recovers.
Report Operation
If a power failure occurs while the GX/GP is creating a report, it will continue to create it
when it recovers.
If timers expire during a power failure, timeout processing occurs using the data up to
the power failure when the GX/GP recovers. If this occurs, the report data will contain a
power failure mark.
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