5. Configuration
5.4. Configuring Fieldbus Components In a Control Strategy
122 Experion PKS Series A Fieldbus Interface Module User's Guide R400
Honeywell July 2010
The following are some pertinent characteristics about this application and the
corresponding Experion control strategy for reference.
The goal is to recycle the process fluid back to the process with a minimum swing in
the recycle feed rate.
The tank level set point (SP) is 50 percent.
The tank level low (LO) alarm is 25 percent and the low-low (LOLO) alarm is 15
percent.
The tank level high (HI) alarm is 70 percent and the high-high (HIHI) alarm is 85
percent.
The Experion control strategy includes a tank level Control Module (CM) named
CM101 and a pump control CM named CM102.
The CM101 includes an Experion Proportional, Integral, Derivative (PID) function
block configured to operate as a Proportional and Integral (PI) two-mode controller.
The tuning for the PI controller is "loose" to allow some swing in the level of fluid in
the tank.
The CM101 includes an Experion Data Acquisition (DATAACQ) function block to
provide the alarm flags for the LO, LOLO, HI, and HIHI tank level alarms.
The CM101 includes a fieldbus Analog Input (AI) function block to integrate the
tank level indicating signal from the ST3000FF smart pressure transmitter with the
control strategy. It includes a fieldbus Analog Output (AO) function block to
integrate the Logix 1400 Valve Positioner with the PI controller output from the
control strategy.
The CM102 includes an Experion Device Control (DEVCTL) function block to
control the recycle pump through corresponding Discrete Input and Discrete Output
Input/Output Module function blocks. It also includes links to the LO and LOLO
alarm flags for the DATAACQ block in CM101 for device safety override and
output override interlocks, respectively.
The recycle pump is to be restarted at 35 percent.
Configuration considerations only for redundant CIOM-A FIM applications
Obse
rve the following considerations when configuring fieldbus devices with redundant
CIOM-A FIM applications.
To Next Page
Loading...
