EP03-300-200
December,
2003
Release 200
Version 1.0
Experion PKS CEE-based Controller Specifications and Models
7
Control Strategy Building
Experion PKS control strategies are built using
Control Builder,
a graphical, object-oriented tool that
supports the Control Execution Environments of the Experion PKS Control Processor, Application
Control Environment and Simulation Control Environment. It allows
system design, documentation, and
monitoring. It provides comprehensive handling of various I/O points, including Fieldbus, Profibus,
and DeviceNet. In addition, it covers continuous, logic, motor, sequential, batch and advanced control
functions through a library of
Function Blocks (FBs)
. Function Blocks are basic block types provided
by Honeywell to perform different control functions. Each block supports parameters that provide an
external view of what the block is doing. FBs easily interconnect via “soft wires” to construct control
applications or strategies.
Function Blocks
are grouped together and contained in
Control Modules (CMs)
and, in the case of
sequential FBs,
Sequential Control Modules (SCMs)
. SCMs greatly simplify batch logic
implementation by sequencing a group of process equipment through a series of distinct steps to
accomplish one or more process tasks.
CMs
and
SCMs
act as
“containers”
for Function Blocks.
This is a very powerful tool for creating, organizing, and checking out control strategies. Figure 3
illustrates a simple Control Module -- in this case a PID loop -- consisting of basic FBs. In this
example, several FBs are “contained” within the CM named FIC101, and the AI and AO FBs are
executing in F
OUNDATION
Fieldbus devices. Each Control Module may be scheduled at its own
execution rate from 5 msec to 20 sec (depending on the controller), and the user can schedule
Function Blocks and Control Modules to execute in any desired order.
Figure 2.
Control Builder Supports a Powerful Set of Algorithm
Libraries for Implementing Process Control Strategies
