Rockwell Automation PLC-5 Fieldbus Solutions for Integrated Architecture User Manual - Manual (Page 34)

Publication 1757-UM006A-EN-P - May 2002
1-20 The Fieldbus Communication Model
Table 1.J Manual Loader Block Specifications
Description The Manual Loader function block output is not set by the block's algorithm. Its output can be set by an operator in the
Manual mode or a program in the Remote-Out mode. A functional schematic of the block is shown in Figure 1.10 for
reference.
Function Notes
• Supports Out of Service (OOS), Initialization Manual (IMan), Local Override (LO), Manual (Man), and Remote-Out
(ROut) modes.
• Accepts output from an AI block as its input (IN) to get a PV filtered by PV_FTIME.
• The block's algorithm uses value and status for alarming only.
• If selected, the STATUS_OPTS of IFS if BAD IN will work.
• The BKCAL_IN value and status can force balancing of the output.
• 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 Remote-Out (ROut) 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 ROUT_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.
Parameters
(see Appendix A
for definitions of
each parameter) ACK_OPTION
ALARM_HYS
ALARM_SUM
ALERT_KEY
BKCAL_IN
BLOCK_ALM
BLOCK_ERR
CONTROL_OPTS
GRANT_DENY
HI_ALM
HI_HI_ALM
HI_HI_LIM
HI_HI_PRIHI_LIM
HI_PRI IN
LO_ALM
LO_LIM
LO_LO_ALM
LO_LO_LIM
LO_PRI
LO-LO_PRI
MODE_BLK
OUT
OUT_HI_LIM
OUT_LO_LIM
OUT_SCALE
PV
PV_FTIME PV_SCALE
ROUT_IN
ROUT_OUT
SHED_OPT
ST_REV
STATUS_OPTS
STRATEGY
TAG_DESC
TRK_IN_D
TRK_SCALE
TRK_VAL
UPDATE_EVT