Siemens Module B3 Manual De Usuario

 

 

 

 

 

 

 

   

 

 

 

 

T I A  Training Document 

Page 26 of 64 

  Module 

 

The D-controller generates its controller output from the rate of change of the system deviation, and 

not -like the P-controller- from its amplitude. For that reason, it still responds considerably faster than 

the P-controller. Even if the system deviation is small, it generates -in anticipation, as it were- large 

margins of the manipulated variable as soon as the amplitude changes. On the other hand, the D-

controller does not know a lasting system deviation; because, regardless of how large it is, its rate of 

change equals zero.  In practice, the D-controller is used rarely by itself for that reason.  Rather, it is 

used together with other control elements, usually in connection with a proportional component. 

2.7.3.5 PID Controllers 
 

If we expand a PI controller with a D-component, we enhance the universal PID controller. As in the 

case of the PD controller, adding the D-component has the effect that, if laid out correctly, the 

controlled variable reaches its setpoint sooner and enters the steady state faster.  

 

 

 
Block Diagram

 

 

 

 

 

 

 

 

 

 

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

B3 

Issued: 02/2008                                                                                                                                     Control Engineering with STEP 7