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3. Fieldbus Integration With Experion System
3.2. Control Integration
means that the fieldbus block's BKCAL_OUT parameter is published by the downstream
block and subscribed to by the FIM.
The client/server method allows the FIM to appear as a computing device on the H1 link.
The FIM writes the output (OP) to be read by fieldbus device resident blocks such as
Analog Output and Proportional, Integral, Derivative (PID) through their RCAS_IN
parameter input connection. This connection is generally used when the downstream
control block is in the RCas (Remote Cascade) mode. This means that the fieldbus
block's BKCAL_OUT parameter is written by the downstream block and read by the
FIM.
The client/server method also allows the FIM to function in a Direct Digital Control
(DDC) mode or the Remote Out mode in fieldbus terms. In this case, the FIM writes the
output to be read by the fieldbus PID block though its ROUT_IN parameter input
connection. In turn, the PID block publishes the ROUT_OUT or back calculation output
value for the subscribing FIM.
The Control Builder data quality is converted to fieldbus data quality. The Control
Builder Good indication is represented as fieldbus Good (Cascade).
The Control Builder limit indications of no-limit, limited-low, limited-high, and constant
are mapped to the same four indications for fieldbus.
The Control Builder control initialization indicators map only to the limited number of
substatus conditions that have corresponding indications in fieldbus Good (Cascade).
Fieldbus device Discrete Input integration
A user can functionally "wire" the output from a Discrete Input (DI) function block in a
fieldbus device residing on an H1 link to the input of a Device Control (DEVCTL)
function block or other block with a digital input contained in a Control Module in the
Experion Control Builder application.
The following simplified functional diagram shows how the output from an Discrete
Input function block in a fieldbus compliant transmitter is integrated with a Device
Control (DEVCTL) function block in a Control Module that is assigned and loaded to the
CEE in the Control Processor Module (CPM).
50
Experion PKS Series A Fieldbus Interface Module User's Guide
Honeywell
R400
July 2010
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