Troubleshooting The Input Selector Block; Table 26: Input Selector Block - Honeywell ST700 User 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.
Page 104 FOUNDATION Fieldbus ST 700 Pressure Transmitter User's Guide

Table 26: 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.
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.
Revision 2.0