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
Whe
n 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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