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3. Fieldbus Integration With Experion System
3.2. Control Integration
R400
Experion PKS Series A Fieldbus Interface Module User's Guide
45
July 2010
Honeywell
CM
CPM/CEE
FIM
Fieldbus
Device
FIM
Analog
Input
Transducer
PID
AOC
OUT
PV
OP
OP
AOC = Analog Output Channel
CEE = Control Execution Environment
FIM = Fieldbus Interface Module
OP = Output
PID = Proportional, Integral, Derivative
CM = Control Module
CPM = Control Processor Module
PV = Process Variable
Figure 6 Integration of fieldbus device analog input signal with Control
Builder control strategy
Fieldbus Analog Input data manipulation
When the OUT from the fieldbus analog input function block is wired to the PV input for
a PID function block, the Control Builder creates a CEE input agent to handle the analog
input from the fieldbus block. The block-like input agent maps the data structure (DS-65)
of the OUT parameter to the Control Builder PV with status parameter. It interprets the
value portion in fieldbus terms and converts it to Control Builder representation. The
floating-point representation is identical, in most cases, but the fi/-infinity value
must be converted to a Control Builder representation.
If the fieldbus status byte indicates "BAD", the value must be converted to Not a Number
(NaN) for Control Builder representation. The fieldbus data quality of good, bad, and
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