CM579PnioImplicitRead (FB)

FUNCTION_BLOCK CM579PnioImplicitRead EXTENDS CM579PnioBase

Function block that implements acyclic read service. It has to be considered that the execution of the function block could take a few seconds when devices are not existing or not reachable.

InOut:

Scope	Name	Type	Initial	Comment	Inherited from
Input	Execute	BOOL	FALSE	A rising edge starts the operation, the output Busy goes to TRUE. In the first cycle all other inputs are read and stored, afterwards they are ignored. A falling edge does not stop the operation. After Done = TRUE or Error = TRUE and Execute = FALSE all outputs will be reset.	AbbETrig2
Output	Done	BOOL	FALSE	Operation is completed without error (while outputs Busy and Error are FALSE). This output is TRUE for at least one cycle or until Execute is set to FALSE	AbbETrig2
	Busy	BOOL	FALSE	Operation is running (while outputs Done and Error are FALSE)	AbbETrig2
	Error	BOOL	FALSE	Operation is stopped with error (while outputs Busy and Done are FALSE). This output is TRUE for at least one cycle or until Execute is set to FALSE. The output ErrorID gives more details about the error.	AbbETrig2
Input	Device	AC500_IoDrvCM579Profinet.IDeviceCM579Profinet		instance of CM579-PNIO device	CM579PnioBase
Output	ErrorID	ERROR_ID		error code that describes occurred error	CM579PnioBase
	AddErrorID	UDINT		additional description of error, meaning depends on value of output ErrorID	CM579PnioBase
Input	DevIPAddr	UDINT		IP address of device
	DevVendorID	UINT		Vendor ID of device
	DevDeviceID	UINT		Device ID of device
	DevInstanceID	UINT		Instance ID of device
	DevApi	UDINT		API of submodule from which the data object is to be read
	DevSlot	UINT		slot of submodule from which the data object is to be read
	DevSubSlot	UINT		subslot of submodule from which the data object is to be read
	DevIdx	UINT		index of data object to read
	Data	POINTER TO BYTE		pointer to buffer where the read data will be copied to
	DataMax	UINT		size of buffer provided at input Data
Output	StatusCode	UDINT		PROFINET status code of read service according to PROFINET specification
	AddVal1	UINT		additional value 1 returned from PROFINET IO Device
	AddVal2	UINT		additional value 2 returned from PROFINET IO Device
	DataLen	UDINT		number of bytes that was read

Properties:

Job

Methods:

CheckInputs

PrepareJob

ResetOutputsAndMembers

SetOutputs

Structure:

• CyclicAction
  • CM579PnioImplicitRead.SetOutputs (METH)
• CM579PnioImplicitRead.Job (PROP)
• ResetAction
  • CM579PnioImplicitRead.ResetOutputsAndMembers (METH)
• StartAction
  • CM579PnioImplicitRead.CheckInputs (METH)
  • CM579PnioImplicitRead.PrepareJob (METH)