SysCpuTestAndReset (FUN)

FUNCTION SysCpuTestAndReset : RTS_IEC_RESULT

<description>

Test and reset a bit in an ULONG variable in one processor step. This operation is to provide

a multitasking save operation.

</description> <result><p>RESULT: Returns the runtime system error code (see CmpErrors.library).

ERR_OK: If bit could be reset and was set before, ERR_FAILED: If bit is still reset

</p></result>

InOut:

Scope	Name	Type	Comment
Return	SysCpuTestAndReset	RTS_IEC_RESULT
Input	pulValue	POINTER TO UDINT	<param name=”pulValue” type=”IN”>Pointer to the unsigned value to test and reset a bit inside in one atomic processor step</param>
	ulBit	UDINT	<param name=”ulBit” type=”IN”>Bit number inside the variable to test and reset. 0=first bit, 31=last bit</param>