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Entry type: Application example Entry ID: 43033319, Entry date: 05/28/2010
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Configurating of Cascade Control

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The project example shows the application of cascade control to a simulated process with one main and one auxiliary process variable.

Objective of the Application
A cascade control structure can be established if, beside the main process variable, more system variables are measured and fed back as auxiliary process variables, creating subordinate control loops. Thus there is a master (or main) control loop and a slave (or auxiliary) control loop.
Cascade control is one of the most common control system structures in process plants.

The objective of this application note is to show the issues in configuration of cascade control loops that are particularly relevant to achieve fast dynamics and correct behaviour in all operating modes of real world applications.

Main contents
The following issues are discussed in this application note:

  • Interaction between master and slave controller with respect to controller tuning
  • Interaction between master and slave controller with respect to operating mode changeovers
  • Simulation example

Validity
This entry was created with SIMATIC PCS 7 V7.1, the procedure is transferable to PCS 7 V7.0 SP1 and higher versions.

Downloads
  Documentation - Configurating of Cascade Control (774,7 KB) 

History
05/2010 First release


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