`CM579PnioRead` (FB)

FUNCTION_BLOCK CM579PnioRead EXTENDS CM579PnioBase

function block that implements acyclic read service

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
Output	`AddErrorID`	`UDINT`		additional description of error, meaning depends on value of output ErrorID	CM579PnioBase
Input	`DevName`	CM579PnioDevName		name of device from which the data object is to be read (e.g. ‘ci501-pn-01’ )
	`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:

CM579PnioRead (FB)

`CM579PnioRead` (FB)