Troubleshooting The Input Selector Block; Table 28: Input Selector Block - Honeywell SLG 700 Option Manual

Troubleshooting the Input Selector block

Problem Cause
Input Selector block
mode is in OOS and
does not change to
AUTO mode.
Input Selector block
mode is in OOS mode
with Block
configuration Error.
Status of output is
Bad.
Block alarms are not
reported.
Rev.5
Table 31: Input Selector block
Things to check
Read
MODE_BLOCK.PERMITTED
.
Read MODE_BLOCK.
ACTUAL of Resource block.
Schedule
Check SELECT_TYPE
Check Inputs
Check OP_SELECT
Check MIN_GOOD
Read FEATURE_SEL.
Read LIM_NOTIFY.
FOUNDATION Fieldbus Option User's Manual
Recommended Action
Add AUTO mode 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.
SELECT_TYPE must be set to a
valid value and cannot be left at 0.
Make sure at least one input has
status as good.
OP_SELECT is not set to 0 (or it is
linked to an input that is not used),
and it points to an input that is
Bad.
Make sure that value entered in
MIN_GOOD is greater or equal to
actual number of Good inputs.
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.
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