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3. Fieldbus Integration With Experion System
3.3. Control Mode Interaction
R400
Experion PKS Series A Fieldbus Interface Module User's Guide
57
July 2010
Honeywell
Bit
Quality
Substatus, if Quality field is
Limits
BAD UNCERTAIN
GOOD
(Non-
Cascade)*
GOOD
(Cascade)*
6
No Comm-
unication,
with no
Last
Usable
Value
Sub-Normal
Unacknow-
leged Critical
Alarm
Local
Override
(LO)
7
Out-Of-
Service
Fault-State
Active
(FSA)
8
Initiate
Fault-State
(IFS)
* 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
About
modes of operation
paragraph in the
Standard Function Blocks
section of
Appendix A
.
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