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10. Appendix A
10.2. Standard Function Blocks
414
Experion PKS Series A Fieldbus Interface Module User's Guide
BKCAL_OUT will not request initialization.
Use the Balance Ramp CONTROL_OPTS to maintain
the ratio SP value, when the block is in Manual (Man)
mode. An internal value follows the actual value
required to maintain balance. When block mode
changes to Automatic (Auto), the internal value ramps
to zero contribution in BAL_TIME seconds. If Balance
Ramp option is OFF or not used, the ratio SP value
immediately changes to follow the changes to the input
or output, when the block is in Man mode.
The TRK_VAL input brings in an external value or
uses a constant. The TRK_SCALE values convert the
TRK_VAL to a percent of output span value. If the
CONTROL_OPTS Track Enable selection is true and
TRK_IN_D is true, the converted TRK_VAL replaces
the output (OUT), when the block is in Automatic
(Auto), Cascade (Cas), or Remote Cascade (RCas)
mode. The CONTROL_OPTS Track in Manual
selection must be true for this to occur in Manual
mode. If the actual mode is OOS or IMan, the track
request is ignored.
If the TRK_VAL replaces the OUT, its status becomes
Locked Out with Limits set to Constant. The actual
mode goes to LO. The status of BKCAL_OUT, and
RCAS_OUT goes to Not Invited (NI), if not already
there.
If the status of TRK_IN_D is Bad, its last usable value
will be maintained and acted upon. If the device
restarts, losing the last usable value, it will be set to
false.
If the status of TRK_VAL is Bad, the last usable value
will be used. If there is no last usable value, the
present value of the OUT will be used.
Use the Obey SP limits if Cas or RCas
CONTROL_OPTS to use SP value after limiting in Cas
or RCas mode.
Use the "Use PV for BKCAL_OUT" CONTROL_OPTS
to the PV value for the BKCAL_OUT value.
Honeywell
R400
July 2010
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