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10. Appendix A
10.2. Standard Function Blocks
Figure 38 Using Function Blocks in fieldbus devices to form a control
About modes of operation
Every Function block includes a mode parameter with configured permitted modes. This
structured parameter is composed of the actual mode, the target mode, the permitted
mode, and the normal mode. The normal mode is the desired operating mode. The actual
mode reflects the mode used during block execution. The target mode may be set and
monitored through the mode parameter. The permitted mode defines the allowable target
mode settings. The following table provides a summary of the available modes of
operation and their effect on operation.
Mode
Out of Service
Initialization Manual
384
Experion PKS Series A Fieldbus Interface Module User's Guide
Fieldbus
AI Block
PID Block
Device 1
loop.
Abbreviation
OOS
The block is not being evaluated. The output
is maintained at the last value, an assigned
fault state value -last value or configured
fault state value. Set Point is maintained at
last value.
IMan
The block output is being set in response to
the back-calculation input parameter status.
Honeywell
AO Block
Device 2
Operation Effect
R400
July 2010
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