Yokogawa Button Operated MV2000 - Manual (Page 56)

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IM MV1000-01E
Feature Overv
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Index
Specal Data Handlng Cases and Exceptons
This section explains special data handling cases and exceptions for TLOG computation,
CLOG computation, and reports.
• Power Falure Data Handlng (for TLOG and reports)
If a power failure occurs when the report function is enabled or in the middle of a
TLOG operation, the report and TLOG operations resume when the MV recovers from
the power failure. The operation executed after recovery varies depending on whether
the MV recovers from the power failure before or after the report or TLOG data
production time.
Tme of Recovery Operaton
After the data
production time
The report or TLOG data is produced immediately after the MV
recovers. The measured data up to the time of the power failure
is used. When the next report or TLOG is produced, the data after
recovery from the power failure is used.
Before the data
production time
After the MV recovers, the report or TLOG is produced at the data
production time. The measured data is used with the data for the
power failure period left out.
• Handlng of Abnormal Data (TLOG, CLOG, and reports)
If an error occurs in channel or other data, the abnormal data is discarded, and the
computation continues. If all of the data is abnormal, an error message is produced.
The following result in abnormal data:
• When channels are set to Skip or Off.
• When an error value is returned as a measured result on a measurement channel
(A/D converter failure, etc.).
• When a measurement channel is in a burnout condition
• When an error value is returned as the computed result on a computation channel.
• When an external input channel is Off or when data is not being received from it (in
cases such as when communication is prohibited).
• How Overflow Data Is Handled
* Overflow data refers to range-out values on measurement, computation, and external input
channels.
For TLOG, CLOG, and reports
Channel overflow data is handled in the following ways:
Operaton Descrpton
Average, Sum You can choose from three methods of handling the data: ERROR,
SKIP, and LIMIT.
ERROR: Treats the data as a computation error.
SKIP:
Discards the overflow data and continues the computation.
LIMIT: Replaces the data with the limit value and continues the
computation.
The limit value is the span upper or lower limit, or the scale
upper or lower limit of the channel.
Maximum, minimum,
maximum-minimum
You can choose one of two methods of handling the data: OVER, or
SKIP.
OVER:
Performs the computation using the overflow data.
SKIP: Discards the overflow data and continues the computation.
For Multplcaton, and Relatonal Computatons EQ and NE
Operaton Type Calculated Values Computed Result
Multiplication 0*(+Over) 0
0*(-Over) 0
(+Over)*0 0
(-Over)*0 0
.EQ. (+Over).EQ.(+Over) 0
(-Over).EQ.(-Over) 0
.NE. (+Over).NE.(+Over) 1
(-Over).NE.(-Over) 1
1.9 Computaton and Report Functons (/M1 and /PM1 optons)