Catalog ST PCS 7.1 - September 2005

3
Advanced Process Control
MATLAB/SIMULINK-DDE client:
Online coupling for APC
■ Overview
Controller
structure
MATLAB/SIMULINK is a universal mathematical software tool
with a host of functions for control engineering, information processing,
model creation, optimization and data analysis. It is the
most widely used software tool for the development of high quality
advanced process control (APC) algorithms.
The MATLAB/SIMULINK-DDE client can be used for implementing
the APC algorithms, which are tested in an offline simulation,
in the real-time operation on the process. The client permits realtime
linking of MATLAB/SIMULINK to any DDE server and thus a
"rapid prototyping" of automation functions with the entire stock
of MATLAB libraries. As the algorithm developed in MATLAB
does not have to be implemented again, the potential errors of a
re-implementation and the associated engineering time and
costs can be saved in advanced process control projects.
■ ■ More information
Application
Siemens AG
Via a DDE channel, MATLAB/SIMULINK can gain read and write
Industrial Solutions & Services
access to all variables declared in the operator system of the
SIMATIC PCS 7 process control system (DDE server). MATLAB/ Phone: +49 91 31 7-461 11
SIMULINK and the MATLAB/SIMULINK-DDE client can be in- Fax: +49 91 31 7-447 57
stalled either on an operator station or an additional PC. Communication
is initialized and controlled by the DDE client.
E-mail: it4industry@siemens.com
Typical procedures in developing Advanced Process Control solutions:
Additional information is available in the Internet under:
• Offline analysis of the problem to be solved, also including the
analysis of measured process data in MATLAB/ SIMULINK
• Offline synthesis of possible solutions with MATLAB/
SIMULINK
• Offline test by simulation of the solutions with MATLAB/
SIMULINK
http://www.siemens.com/matlab
• Configuration of the link on the SIMATIC PCS 7 process
control system, parameterization of the DDE server
• Configuration of possible back-up functions in the process
control system
• Connection of MATLAB/SIMULINK to the process control system
• Test and optimization of the solution on the process
• If required, transfer of tried and tested functions into function
blocks that can be integrated into the process control system
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adde.m
edde.m
Trigger
MATLAB/SIMULINK
PC
DDE
OS
Siemens ST PCS 7.1 · September 2005
Control
system
structure
-1
PCS 7
Real
process
■ Function
The MATLAB/SIMULINK-DDE client comprises three blocks:
• Trigger block
The trigger block enables the user to specify the DDE communication
partner, the data format and the sampling time. It synchronizes
and monitors the communication and issues warnings
if the DDE channel is defective or interrupted.
• Input and output block (Edde/Adde)
The "Adde" block writes data from MATLAB to the DDE server.
Each block can manage up to four variables, and several
blocks are possible. The "Edde" block reads variables into
MATLAB and converts them into the corresponding format.
• MATLAB/SIMULINK-DDE client
- Link to any SIMATIC systems by means of a PCS 7 Operator
Station and the associated DDE server, or directly via the
SIMATIC NET OLE/DDE Manager
- Network link to SIMATIC PCS 7 by means of an @aGlance
server "@PCS7", TCP/IP and the standard @aGlance DDE
bridge
- Link to older control systems, e.g. TELEPERM M via
WinTM/Server
- Link to any DDE server
■ Selection and Ordering Data Order No.
MATLAB/SIMULINK-DDE client
for SIMATIC PCS 7 V5.x, V6.0 and
V6.1
2XV9 450-1WC12-0LA0 C)
C) Subject to export regulations AL: N, ECCN: EAR99S