Yokogawa digitalYEWFLO (DY-FF) - Manual (Page 103)

A5.5.2 Determining the Output Value
The value of OUT.Value is determined as follows:
● For counting up
OUT = integration start value (0) + Total
● For counting down
OUT = integration start value (TOTAL_SP) -
Total
Total: Total of integrated values. This value
is retained even if INTEG_TYPE is changed
during integration (in AUTO).
OUT_TRIP(#14):0
OUT_PTRIP(#15):0
OUT_TRIP(#14):1
OUT_PTRIP(#15):1
Counting up starting from 0
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PRE_TRIP(#31)
OUT_TRIP(#14):0
OUT_PTRIP(#15):0
OUT_TRIP(#14):0
OUT_PTRIP(#15):1
OUT_TRIP(#14):1
OUT_PTRIP(#15):1
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Counting down starting from TOTAL_SP
PRE_TRIP(#31)
0
0 TOTAL_SP(#7)
TOTAL_SP(#7)
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OUT_TRIP(#14):0
OUT_PTRIP(#15):1
If OUT is rewritten in the MAN mode, integration
starts with the value rewritten in MAN mode after
the mode was returned to AUTO.
The values in OUT_TRIP and OUT_PTRIP are
determined according to the correlation between
OUT and TOTAL_SP/PRE_TRIP.
For counting up, the OUT value is as follows:
● OUT < TOTAL_SP - PRE_TRIP
OUT_TRIP = 0, COUT_PTRIP = 0
● TOTAL_SP - PRE_TRIP <= OUT < TOTAL_
SP
OUT_TRIP = 0, COUT_PTRIP = 1
● TOTAL_SP <= OUT
OUT_TRIP = 1, COUT_PTRIP = 1
For counting down, the OUT value is as follows:
● PRE_TRIP < OUT
OUT_TRIP = 0, COUT_PTRIP = 0
● 0 < OUT <= PRE_TRIP
OUT_TRIP = 0, COUT_PTRIP = 1
● OUT <= 0
OUT_TRIP = 1, COUT_PTRIP = 1
Note that the given conditions do not apply to the
following cases:
• If INTEG_TYPE is 5, 6, or 7, OUT_TRIP and
OUT_PTRIP always output “0.”
• If INTEG_TYPE is 1 or 3, occurrence of
AutoRESET (reset caused if the threshold is
exceeded) causes OUT_TRIP to hold “1” for
fi ve seconds.
<APPENDIX 5. INTEGRATOR (IT) BLOCK>
A5-7
IM 01F06F00-01EN