Siemens Module B3 ユーザーズマニュアル

 

 

 

 

 

 

 

   

 

 

 

 

T I A  Training Document 

Page 7 of 64 

  Module 

 
 

 
 

2.1 Tasks of Control Engineering 
 

"Closed loop control is a process where the value of a variable is established and maintained 

continuously through intervention based on measurements of this variable. This creates a sequence 

that takes place in a controlled loop -the closed loop- because the process is executed based on 

measurements of a variable that is in turn influenced by itself.“  

The variable to be controlled is measured continuously and compared with another specified 

variable of the same kind.  Depending on the result of this comparison, the control process adjusts 

the variable to be controlled to the specified variable. 

 

 

 

Diagram of a Control System 

 
 Comparing 
 Element 

Controllg. 
Element 

   Actuator 
 

Final Ctrl. Elem.

 

+ System

 

Setpoint 
Temperature 

Measuring 
Device 

 

Preface     Fundamentals     Discontinuous Action Controller     Controller Block (S)FB41     Setting the System     Appendix 

B3 

Issued: 02/2008                                                                                                                                     Control Engineering with STEP 7