Lenze DDS v2.3 Manual do Utilizador descarregar pdf (Página 303)

100

101

Drive PLC Developer Studio

IEC 61131-3 Standard functions

14-11

l DDS EN 2.3

14.4.3 SEMA

Software semaphore (interruptible)

X is an internal BOOL variable initialized with FALSE .

BUSY, CLAIM and RELEASE are of type BOOL.

• If SEMA is called and BUSY is TRUE, SEMA has already been assigned

(SEMA was called using CLAIM = TRUE).

• If BUSY is FALSE, SEMA has either not been called yet or been enabled

(call with RELEASE = TRUE).

BUSY = SEMA(CLAIM, RELEASE) means:

BUSY:=X;

IF CLAIM THEN X:=TRUE;

ELSIF RELEASE THEN BUSY:=FALSE; X:=FALSE;

END_IF

Examples

Declaration:

SEMAInst : SEMA;

IL FBD

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

LD SEMAInst.BUSY

ST VarBOOL3

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

VarBOOL3:=SEMAInst.BUSY;

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