Troubleshooting The Proportional Integral Derivative (Pid) Block; Table 27: Pid Block - Honeywell SLG 700 Option Manual

Troubleshooting the Proportional Integral Derivative (PID) block

Problem Cause
PID block mode is in
OOS mode, and does
not change to AUTO,
CAS, RCAS and
ROUT mode.
PID block mode is in
OOS mode with Block
configuration Error.
Mode does not
change from IM,
target mode is MAN,
AUTO, or Cas.
Mode does not
change from MAN;
target mode is MAN,
AUTO, or Cas.
Mode does not go to
Cas, target mode is
Cas.
Value of output does
not make sense
Block alarms are not
reported
Page 186
Table 30: PID block
Things to check
Read
MODE_BLOCK.PERMITTED.
Read MODE_BLOCK.
ACTUAL of Resource block.
Schedule
Read parameters:
BYPASS
SHED_OP
Read
SP_HI_LIM, SP_LO_LIM
OUT_HI_LIM, OUT_LO_LIM
No path to process.
Check Input blocks.
Check Upstream block.
Check Cascade Initialization
Read FEATURE_SEL
Read LIM_NOTIFY
FOUNDATION Fieldbus Option User's Guide
Recommended action
Add AUTO, CAS, RCAS and ROUT
modes to
MODE_BLOCK.PERMITTED.
If necessary, Set
MODE_BLOCK.TARGET to AUTO.
NOTE:
If the mode is set to OOS for
maintenance then do not change
the mode to AUTO.
Block is not scheduled and
therefore cannot execute to go to
Target Mode. Schedule the block to
execute.
The default values of these
parameters are configuration errors
and they must be set to a valid
range. See Table 35.
Check that SP_HI_LIM <
SP_LO_LIM, OUT_HI_LIM <
OUT_LO_LIM.
Assure that the downstream blocks
to at least one AO are all in Cas
mode and that the path ends in an
AO block. All BKCAL connections
must be linked.
The status of IN is Bad, not
connected.
The upstream block cannot not able
to complete cascade initialization
for some reason. Assure that
BKCAL_OUT is connected to
BKCAL_IN of the upstream block.
Assure that the output can move an
actuator.
Reports are not selected in
FEATURE_SEL. If features do not
include Reports then the host must
poll for alarms.
Set LIM_NOTIFY to a value higher
than zero, but not higher than
MAX_NOTIFY.
Rev. 3.0