<Appendix 2. Integrator (It) Block>
246
IM 01E21A02-03EN
A2.5 Output Process
There are the following three output parameters:
1. OUT
2. OUT_TRIP
3. OUT_PTRIP
Parameters OUT_TRIP and OUT_PTRIP are used only when INTEG_TYPE is from 1 to 4.
In case that IT block related memory failed, the status of OUT, OUT_TRIP, OUT_PTRIP becomes
“Bad-DeviceFailure”.
A2.5.1 Status Determination
The same criteria for determining the status of the output of the IT block are used in common for
the above three parameters.
0% UNCERT_LIM GOOD_LIM 100%
PCT_INCL
GOOD
Uncertain
Bad
PCT_INCL=1003(1 - (msp of RTotal)/(msp of ATotal))
msp of RTotal: RTotal value that is converted into a short floating-point number
msp of ATotal: ATotal value that is converted into a short floating-point number
RTotal: Integrated value of the absolute values of the increments whose status is bad
ATotal: Integrated value of the absolute values of the increments regardless of the output status
FA0204.EPS
OUT.Value,OUT_TRIP.Status,andOUT_PTRIP.Statusaredeterminedbytheratioofthe“Good”
integratedvaluestoallintegratedvalues,whichisstoredinPCT_INCL(0%to100%).Theuser
must set the threshold of each status to UNCERT_LIM and GOOD_LIM.
The IT block determines the status of the output using the three parameters: PCT_INCL,
UNCERT_LIM, and GOOD_LIM.
z PCT_INCL≥GOOD_LIM
=>Good
z UNCERT_LIM≤PCT_INCL<GOOD_LIM
=>Uncertain
z PCT_INCL<UNCERT_LIM
=>Bad
IfINTEG_TYPEis5,6,or7,thestatusofthetripoutputbecomes“Good-NS-Constant”.
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