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Bit
Quality
6
7
8
* The Good (non-cascade) substatus is used by output connections for fieldbus blocks
such as Analog Input and Discrete Input. The Good (cascade) substatus is used by output
connections for fieldbus blocks such as PID. Both of these substatuses are converted to
the single system data quality of Good.
Fieldbus status indications
REFERENCE - INTERNAL
Please refer to Fieldbus Status Display Indications in Appendix C for list of
possible display indications associated with a given fieldbus status and
definitions of related substatuses.
3.3
Control Mode Interaction
Fieldbus block modes versus control modes
Every fieldbus function block including Resource and Transducer blocks contain the
MODE_BLK parameter. This structured parameter consists of the Actual, Target,
Permitted, and Normal modes. The eight possible modes are described in the
modes of operation
R400
Experion PKS Series A Fieldbus Interface Module User's Guide
July 2010
Substatus, if Quality field is
BAD
UNCERTAIN
No Comm-
Sub-Normal
unication,
with no
Last
Usable
Value
Out-Of-
Service
paragraph in the Standard Function Blocks section of Appendix A.
Honeywell
3. Fieldbus Integration With Experion System
3.3. Control Mode Interaction
GOOD
GOOD
(Non-
(Cascade)*
Cascade)*
Unacknow-
Local
leged Critical
Override
Alarm
(LO)
Fault-State
Active
(FSA)
Initiate
Fault-State
(IFS)
Limits
About
57
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