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Model 4081FG Oxygen Analyzer with F
Troubleshooting
TABLE C-3. Troubleshooting.
C-16
fieldbus Communications
OUNDATION
Refer to Table C-3 to troubleshoot any problems that you encounter.
Symptom
Possible Causes
Mode will not leave
1. Target mode not set.
OOS
2. Configuration error
3. Resource block
4. Schedule
Mode will not leave
1. Back Calculation
IMAN
Mode will not
1. Target mode not set.
change to AUTO
2. Input
Mode will not
1. Target mode not set.
change to CAS
2. Cascade input
Mode sheds from
1. Remote Cascade Value
RCAS to AUTO
2. Shed Timer
Corrective Action
1. Set target mode to something other
than OOS.
2. BLOCK_ERR will show the
configuration error bit set. The following
are parameters that must be set before
the block is allowed out of OOS:
a. BYPASS must be off or on and
cannot be left at initial value of 0.
b. OUT_HI_LIM must be less than or
equal to OUT_LO_LIM.
c. SP_HI_LIM must be less than or
equal to SP_LO_LIM.
3. The actual mode of the Resource block
is OOS. See Resource Block Diagnostics
for corrective action.
4. Block is not scheduled and therefore
cannot execute to go to Target Mode.
Schedule the block to execute.
1. BKCAL_IN
a. The link is not configured (the status
would show "Not Connected").
Configure the BKCAL_IN link to the
downstream block.
b. The downstream block is sending
back a Quality of "Bad" or a Status of
"Not Invited". See the appropriate
downstream block diagnostics for
corrective action.
1. Set target mode to something other
than OOS.
2. IN
a. The link is not configured (the status
would show "Not Connected").
Configure the IN link to the block.
b. The upstream block is sending back
a Quality of "Bad" or a Status of "Not
Invited". See the appropriate
upstream block diagnostics for
corrective action.
1. Set target mode to something other
than OOS.
2. CAS_IN
a. The link is not configured (the status
would show "Not Connected").
Configure the CAS_IN link to
the block.
b. The upstream block is sending back
a Quality of "Bad" or a Status of "Not
Invited". See the appropriate up
stream block diagnostics for
corrective action.
1. Host system is not writing RCAS_IN
with a quality and status of "good
cascade" within shed time (see 2 below).
2. The mode shed timer, SHED_RCAS in
the resource block is set too low. Increase
the value.
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Table of Contents
Troubleshooting
