
20
KH 8384-5 EN
Block model
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SP_HI_LIM (upper set point limit)
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SP_LO_LIM (lower set point limit)
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SP_RATE_DN (set point downward rate limit in AUTO mode)
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SP_RATE_UP (set point upward rate limit in AUTO mode)
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PV_SCALE (range of the process variable (PV) (start, end, unit and decimal point))
The OUT value is generated, while taking into account:
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XD_SCALE (range of the OUT value (start, end, unit and decimal point))
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IO_OPTS (determines the input/output action of the AO TRD, e.g. action on fault detec
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tion)
Action on fault detection
Action on fault detection taken during a communication fault (BAD status)
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The last valid value is used by default.
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By selecting FAULT STATE TO VALUE in the IO_OPTS parameter, the valve moves to the
fault state value FSTATE_VAL configured in the AO Function Block.
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FSTATE_TIME defines the length of time that the AO Function Block will wait to activate
the fault state.
Action on fault detection in OUT OF SERVICE (O/S) mode
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After the AO Function Block has moved to O/S mode, the last valid output value is kept
by default.
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By selecting "AO O/S set fault state" in the ALARM_OPTION parameter of AO TRD, the
valve moves to the fault state value FSTATE_VAL configured in the AO Function Block.
−
FSTATE_TIME defines the length of time that the AO Function Block will wait to activate
the fault state.
See page 83 for parameter list.