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R400
Experion PKS Series A Fieldbus Interface Module User's Guide
July 2010
input (SEL_1, 2, 3).
The status will identify those inputs that are not
selected. Control signals that are not selected are
limited in one direction only as determined by the
SEL_TYPE selection.
The value of each BKCAL_SEL_1, 2, 3 output is the
same as OUT. The limits of back calculation outputs
corresponding to not-selected inputs will be high for a
low selection, low for a high selection, or one of each
for a middle selection.
If the status of an input is Bad, it is not eligible for
selection. If the status of an input is Uncertain, it is
treated as Bad unless the STATUS_OPTS selection is
Use Uncertain as Good.
When all inputs are Bad, the actual mode goes to
Manual. This condition will set Initiate Fault State (IFS)
in the output status, if the STATUS_OPTS setting is
IFS if BAD IN.
If SEL_TYPE selection is Middle and only two inputs
are good, the higher input will be selected.
If the status of BKCAL_IN is Not Invited (NI) or
Initialization Request (IR), it is passed back on all three
back calculation outputs. This causes all initializable
inputs to initialize to the BKCAL_IN value. Otherwise, if
the status of BKCAL_IN is not normal, it is passed
back on the BKCAL_SEL_N, where N is the number of
the selected input. The back calculation outputs for
not-selected inputs just have the Not Selected status
with the appropriate high or low limit set.
When the mode is Manual, no input is selected. All
three back calculation outputs will have a Not Invited
status and Constant limits, with a value equal to OUT.
Honeywell
10. Appendix A
10.2. Standard Function Blocks
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