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6. Operation
6.3. Monitoring Fieldbus Functions Through Monitoring Tab
268 Experion PKS Series A Fieldbus Interface Module User's Guide R400
Honeywell July 2010
Prerequisites
You have completed your control strategy configuration that includes fieldbus blocks
integrated with control modules in Control Builder.
Considerations
The key to optimizing the Link schedule is logically configuring the ORDERINCM
parameter for each block to:
Sequence blocks in a logical order from inputs to outputs and,
Execute non-control blocks after control blocks.
The following are some general latency related considerations to use as reference for
determining the most logical overall sequencing for your Control Strategy.
Assume that faster loops are more critical and have a higher priority than slower
ones on the same link.
Primary or innermost loops are always more critical than secondary or outer
loops. The same is true for lower level loops in multi-level cascades, since the
timing requirements for each level become less critical.
Configurations that do not contain an output type block have a much lower
priority than any configuration that does, since these configurations are most
likely intended for monitoring only.
Back-Calculation publications have the lowest priority, since they only have to
be published before they are needed in the next execution sequence.
Delay execution of non-control loop auxiliary blocks like integrators through the
ORDERINCM parameter sequencing. If they are created last, delay will occur
naturally through the default ORDERINCM parameter sequencing.
See the following procedure to configure the FFLink for automatic schedule
optimization.
Calling up Link Schedule
If You Are in the . . . Then, you can And, the Link Schedule Configuration
shows. . .