12. Appendix C
12.2. Substatus Definitions for Quality Status
R400 Experion PKS Series A Fieldbus Interface Module User's Guide 505
July 2010 Honeywell
Quality Substatus Description
Not Invited
The value is from a block, which does not have
a target mode that would use this input. This
covers all cases other than Fault State Active,
Local Override, and Not Selected. The target
mode can be the next permitted mode of
higher priority in the case of shedding a
supervisory computer.
Not Selected
The value is from a Control Selector that has
not selected the corresponding input. This tells
the upper block to limit in one direction, not
initialize.
Do Not Select
The value is from a block that should not be
selected by a control selection block, due to
conditions in or above the block. As an option,
a block may generate this output status if its
actual mode is not Auto or not Cascade.
Local Override
The value is from a block that has been
overridden by a local key switch or is a
complex AO/DO with interlock logic active. The
failure of normal control must be propagated to
a PID block for alarm and display purposes.
This also implies Not Invited.
Fault State Active
The value is from a block that has Fault State
active. The failure of normal control must be
propagated to a PID block for alarm and
display purposes. This also implies Not Invited.
Initiate Fault State
The value is from a block that wants its
downstream output block to go to Fault State.
This is determined by a block option to initiate
Fault State if the status of the primary input
and/or cascade input goes Bad.
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