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The UTIL.LIB Library

339

Controllers

 

 

 

14.5 Controllers

14.5.1P

The P controller function block:

ACTUAL (actual value) and DESIRED (desired or nominal value) as well as KP, the proportionality coefficient, are all input values of the type REAL.

The output, the absolute control output (OUT), is of the type REAL, and is calculated as follows:

OUT ACTUAL KP ,

whereby =DESIRED-ACTUAL.

Example in FBD:

14.5.2PD

The PD controller function block:

ACTUAL (actual value) and DESIRED (desired or nominal value) as well as KP, the proportionality coefficient, are all input values of the type REAL. TD is of the type DWORD and contains the derivative action time in msec.

RESET is of the type BOOL and serves to reset the controller.

The output, the absolute control output (OUT), is of the type REAL, and is calculated as follows:

 

TD

 

OUT ACTUAL KP

 

 

 

t ,

whereby =DESIRED-ACTUAL. Example in FBD:

WAGO-I/O-SYSTEM 759 WAGO-I/O-PRO 32

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