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Instruction Manual
IM-106-880C, OI
September 2009
7-57
Hazardous Area OCX 8800
Troubleshooting Refer to Table 7-32 to troubleshoot any problems that you encounter.
Table 7-32. Troubleshooting
INPUT SELECTOR (ISEL)
FUNCTION BLOCK
Figure 7-26. Input Selector
(ISEL) Function Block
The Input Selector (ISEL) function block can be used to select the first good,
Hot Backup, maximum, minimum, or average of as many as four input values
and place it at the output. The block supports signal status propagation. There
is no process alarm detection in the Input Selector function block.
Figure 7-28 illustrates the internal components of the ISEL block. Table 7-33
lists the ISEL block parameters and their descriptions, units of measure, and
index numbers.
Symptom Possible Causes Corrective Action
Model will not leave OOS Target model not set Set target mode to something other than OOS.
Configuration error BLOCK_ERR will show the configuration error set. ARITH_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 the target mode.
Typically, BLOCK_ERR will show “Power-Up” for all blocks that are not
scheduled. Schedule the block to execute.
Status of outputs is BAD Inputs Input has BAD status.
Block alarms will not work Features FEATURES_SEL does not have Alerts enabled. Enable the Alert bit.
Notification LIM_NOTIFY is not high enough. Set equal to MAX_NOTIFY.
Status Options STATUS_OPTS has the Propagate Fault Forward bit set. This must be cleared
to cause the alarm to occur.
OUT
IN_1
IN_2
IN_3
ISEL
39930024
SELECTOR
IN_4
DISABLE_1
DISABLE_2
DISABLE_3
DISABLE_4
OP_SELECT
IN (1-4)
DISABLE (1-4)
OP_SELECT
TRK_VAL
SELECTED
OUT
= Input used in the selection algorithm.
= Discrete input used to enable the associated
input channel.
= Input used to override algorithm.
= The value after scaling applied to OUT in
local channel override.
= The selected channel number.
= The block output and status.