Owner's manual

8-5
Input Selector (ISEL) Function Block
Troubleshooting Refer to Table 8-3 to troubleshoot any problems that you encounter.
TABLE 8-3. Troubleshooting
Symptom Possible Causes Corrective Action
Mode will not leave
OOS
Target mode not set. Set target mode to something other
than OOS.
Configuration error BLOCK_ERR will show the
configuration error bit set.
SELECT_TYPE must be set to a valid
value and cannot be left at 0.
Resource block The actual mode of the Resource block
is OOS. See Resource Block
Diagnostics for corrective action.
Schedule Block is not scheduled and therefore
cannot execute to go to Target Mode.
Schedule the block to execute.
Status of output is
BAD
Inputs All inputs have Bad status
OP selected OP_SELECT is not set to 0 (or it is
linked to an input that is not 0), and it
points to an input that is Bad.
Min good The number of Good inputs is less than
MIN_GOOD.
Block alarms will
not work.
Features FEATURES_SEL does not have Alerts
enabled. Enable the Alerts bit.
Notification LIM_NOTIFY is not high enough. Set
equal to MAX_NOTIFY.
Status Options STATUS_OPTS has Propagate Fault
Forward bit set. This should be cleared
to cause an alarm to occur.