Lenze PLC Designer PLC Designer (R2-x) Manual do Utilizador descarregar pdf (Página 650)

L-force | PLC Designer

PLC Designer Libraries

648 DMS 3.2 EN 02/2011 TD29 

Provided by standard.lib.

A Software Semaphore (Interruptible)

BUSY = SEMA(CLAIM, RELEASE) means:

IF CLAIM THEN X:=TRUE;

ELSE IF RELEASE THEN BUSY := FALSE; X:= FALSE;

X is an internal BOOL variable that is FALSE when it is initialized.

The input variables CLAIM and RELEASE as well as the output variable BUSY are type

If BUSY is TRUE when SEMA is called up, this means that a value has already been

assigned to SEMA (SEMA was called up with CLAIM = TRUE). If BUSY is FALSE, SEMA

has not yet been called up or it has been released (called up with RELEASE = TRUE).

Declaration example:

SEMAInst : SEMA ;

Example in IL:

CAL SEMAInst(CLAIM:=VarBOOL1,RELEASE:=VarBOOL2)

LD SEMAInst.BUSY

Example in FBD:

Example in ST:

SEMAInst(CLAIM:= VarBOOL1 , RELEASE:=VarBOOL2 );

VarBOOL3 := SEMAInst.BUSY;

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Lenze PLC Designer PLC Designer (R2-x) Manual do Utilizador Página 650