Lenze PLC Designer PLC Designer (R2-x) Instrukcja Użytkownika Pobierz pdf (Strona 667)

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L-force | PLC Designer

PLC Designer Libraries

 DMS 3.2 EN 02/2011 TD29 665

19.2.4 Controllers

The library util.lib provides the following PD controller function block:

Inputs of the function block:

Variable Data type Description

ACTUAL REAL Current value of the controlled variable

SET_POINT REAL Desired value, command variable

KP REAL Proportionality coefficient, unity gain of the P-part

TV REAL Derivative action time, unity gain of the D-part in seconds, e.g. "0.5" for

500 msec

Y_MANUAL REAL Defines output value Y in case of MANUAL = TRUE

Y_OFFSET REAL Offset for the manipulated variable Y

Y_MIN, Y_MAX REAL Lower resp. upper limit for the manipulated variable Y. If Y exceeds

these limits, output LIMITS_ACTIVE will be set to TRUE and Y will be

kept within the prescribed range. This control will only work if

Y_MIN<Y_MAX.

MANUAL BOOL If TRUE, manual operation will be active, i.e. the manipulated value will

be defined by Y_MANUAL.

RESET BOOL TRUE resets the controller; during reinitialization Y = Y_OFFSET.

Outputs of the function block:

Variable Data type Description

Y REAL Manipulated value, calculated by the function block (see below)

LIMITS_ACTIVE BOOL TRUE indicates that Y has exceeded the given limits (Y_MIN, Y_MAX).

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