KROHNE IFC 090 i Converter FOUNDATION FIELDBUS - Manual (Page 39)

Supplementary Documentation Page 39 of 44
IFC090, IFC090 i with FF
IFC090-FF Configuration
IFC090 FF 01/2006
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If the control system should be notified about a reset events, this must be enabled by setting the option
‘Generate reset event’ in parameter INTEG_OPTS.
5.4.7 Trip and Pre-trip Handling
TOTAL_SP marks not only the value for automatic resets as described in the former section, it also serves as
trip value for batch totalizations.
Batch totalizations are possible for integration types (see 5.4.5) ‘Up auto’, ‘Up demand’, ‘Down auto’, and ‘Down
demand’ and works as follows:
UP auto and UP demand
If OUT ≥ PRE_TRIP ⇒ OUT_PTRIP is set (i.e. set to 255)
If OUT ≥ TOTAL_SP ⇒ OUT_TRIP is set (i.e. set to 1)
Down auto and Down demand
If OUT ≤ PRE_TRIP ⇒ OUT_PTRIP is set (i.e. set to 255)
If OUT ≤ 0 ⇒ OUT_TRIP is set (i.e. set to 1)
If a reset occurs, the conditions that set OUT_PTRIP and OUT_TRIP are no longer true, so they are cleared. In
any case, OUT_TRIP is set for at least 5 seconds, even if a reset happened. From this, the control system
should be able to read the set OUT_TRIP for at least one time.
5.4.8 Status Handling
The status of the output totalization value OUT depends on the statuses of all integrated input values of IN_1
and IN_2.
All inputs are grouped in inputs with Good status, and inputs with Bad status (whereas an input with Uncertain
status is deemed to be Bad). The dynamic parameter PCT_INCL always reflects the percentage ratio of inputs
with Bad status.
What status the output has depends on this Bad ratio. The resulting output status can be configured by setting
the parameters GOOD_LIM and UNCERT_LIM. The relations between these parameters, the ratio PCT_INCL,
and the resulting output status are as follows:
If 100% ≤ PCT_INCL < GOOD_LIM ⇒ Output status = Good
If GOOD_LIM ≤ PCT_INCL < UNCERT_LIM ⇒ Output status = Uncertain
If UNCERT_LIM ≤ PCT_INCL ≤ 0 ⇒ Output status = Bad
5.4.9 Input Value Handling
Normally, the inputs of IN_1 and IN_2 are used as they are: