Yokogawa Touch Screen GP20 - Manual (Page 399)

App-23
IM 04L51B01-01EN
Appendix
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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.