5/12/2017
TECH-538/D.W.O. 23160
Page 119 of 189
Solving problems using Status and Substatus
All input and output parameters of the function blocks are composed of two fields: value and status.
The status field indicates health and quality of the current value being received or generated.
In many cases it can be used for diagnostics and problem solving. See below an explanation on the
most important parameters and how to use them depending on the block type.
Analog Output status and substatus
and to identify configuration and operation problems related to the AO block.
Table 23:
Status and Substatus for OUT parameter in AO blocks
Parameter
Status: Quality-Substatus-Limit
Possible causes and fixes
OUT
Bad-OutOfService-NotLimited
•
Block mode is in OOS, check MODE_BLK parameter.
•
Check Resource block mode in OOS.
•
Check associated Transducer block mode in OOS.
Uncertain-InitialValue-Constant
•
CAS_IN is receiving a BAD status. Check setpoint publisher.
•
Block mode is IMAN.
•
Block mode is CAS or AUTO but no CHANNEL has been
assigned.
Good-NonSpecific-NotLimited
•
This is the expected status when everything is working properly
and the block mode is CAS, AUTO.
Device is in Fault State and STATUS_OPTS = Propagate Fail Bkwd. See Resource block.
Block mode goes to LO (Local Override)
Block mode is in OOS, check MODE_BLK parameter.
Check Resource block mode in OOS.
Block mode is CAS or AUTO but no CHANNEL has been assigned.
Check associated Transducer block mode in OOS or MAN.
check the positioner’s calibration
Position reading is below -2%, check calibration, mechanical assembly
Position reading is above +102%, check calibration, mechanical assembly.