Honeywell Series A User Manual page 392

10. Appendix A
10.2. Standard Function Blocks
392 Experion PKS Series A Fieldbus Interface Module User's Guide
The CONTROL_OPTS selection Act on IR determines
whether initialization requests are to be passed on or
acted on locally by changing the BIAS value.
If the Act on IR option is false, a status of Not Invited
(NI) or Initialization Request (IR) at BKCAL_IN will be
passed to BKCAL_OUT. The BKCAL_OUT value will
be calculated from the value of BKCAL_IN adjusted for
SP and GAIN, as determined by the control or process
status of IN_1. When the upstream block sends an
Initialization Acknowledge (IA) status, this block will
send IA status, since its output will now be nearly equal
to the value of BKCAL_IN.
If the Act on IR option is true, a status of NI or IR at
BKCAL_IN results in an adjustment to SP to balance
OUT to the value of BKCAL_IN. The IA status can be
sent as soon as IR is detected. BKCAL_OUT will not
request initialization.
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,
Cascade, or Remote Cascade 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 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.
Honeywell
R400
July 2010