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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
51
July 2010
Honeywell
CM
CPM/CEE
FIM
Fieldbus
Device
FIM
Digital
Input
Transducer
Device
Control
OUT
DI[1]
DO[1]
CEE = Control Execution Environment
FIM = Fieldbus Interface Module
DOC = Digital Output Channel
CM = Control Module
CPM = Control Processor Module
DOC
SO
Figure 9 Integration of fieldbus device digital input signal with Control
Builder control strategy
Fieldbus Discrete Input data manipulation
When the OUT from the fieldbus Discrete Input function block is wired to the DI[n]
input for a DEVCTL function block, the Control Builder creates a CEE discrete input
agent to handle the digital input from the fieldbus block. The block-like discrete input
agent maps the data structure (DS-66) of the OUT parameter to the Experion DI[n] with
status parameter. It interprets the value portion in fieldbus terms as a Boolean for
Discrete Input (DI) block and as the appropriate multi-state representation for special
fieldbus Device Control (DC) block. The value is converted and represented in Control
Builder at the output.
The discrete input agent accepts inputs from either a published parameter or a
client/server read parameter, depending upon the communication method used.
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