Lenze PLC Designer ApplicationTemplate (PLC Designer R3- Manual de usuario descargar pdf (Pagina 117)

Lenze · ApplicationTemplate · 1.3 EN - 04/2013 117

The L_EATP_ApplicationTemplate library

1_POUs - Program Organization Units

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11.2.2 L_EATP_CriticalSection

This FB contains the lock(), UnLock(), and LockState() methods.

The methods render it possible to ensure consistent data transmission. Consistent data

transmission for instance is required for multitasking systems.

Consistent data transfer

( 99)

Lock()

...reserves a data area of the ACD structure (query the state of the flag).

Unlock()

...releases the previously reserved data area again (reset flag).

LockState()

...queries the inhibit state of a data area (flag set/not set).

Return value

Data type Value/meaning

BOOL Replies whether a data area has been reserved (flag set).

TRUE Data area reserved (flag set).

FALSE Data area not reserved (flag not set).

Return value

Data type Value/meaning

BOOL Replies whether the data area has been released (flag reset).

TRUE Data area released (flag reset).

FALSE Data area not released (flag not reset).

Return value

Data type Value/meaning

BOOL Replies whether flag is set.

TRUE Return value if flag is set.

FALSE Return value if flag is not set.

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Lenze PLC Designer ApplicationTemplate (PLC Designer R3- Manual de usuario Pagina 117