MCV_DiscardParamChg

Discard changes

With this function block, the work list can be deleted, thus discarding all parameter changes in the work list.

CAUTION
If the work list has already been activated with the MCV_ActivateParamChg function block, these changes are active in the controller and can no longer be reversed with this function block. If these modified parameter values are also to be reversed, the original list must be read in with the MCV_ChgParamSet function block.

Block diagram

Parameters of the FB

VAR_IN_OUT
	Axis	AXIS_REF	Axis reference
VAR_INPUT
	Execute	BOOL	Discard changes at rising edge.
	NCListTypeIn	STRING	Identification of parameter or list type, e.g. ACHS_MDS.
	NCParamSetIDIn	UINT	Number of parameter set to be discarded.
VAR_OUTPUT
	Valid	BOOL	Indicates if the changes have been discarded successfully.
	Busy	BOOL	Indicates if the function block is still busy.
	NCListTypeOut	STRING	Identification of parameter or list type, e.g. ACHS_MDS.
	NCParamSetIDOut	UINT	Number of parameter set for which the changes have to be discarded.
	NCWarning	BOOL	Indicates if a warning in the ISG-MCP has occurred.
	NCError	BOOL	Indicates if an error in the ISG-MCP has occurred.
	NCErrorCode	UDINT	Error identification of the error in the ISG-MCP.
	Error	BOOL	Indicates if an error has occurred. Save of parameter set is not executed.
	ErrorID	WORD	Error identification.

Behavior of the FB

The FB is in an error state if "Error = TRUE. The parameter changes could not be reversed correctly. An error has occurred either in the function block itself or in the ISG-MCP. The NCError output parameter indicates whether an error has occurred in the ISG-MCP.

A frequent cause of ISG-MCP errors are absent write privileges or a write-protected work list because, in these cases, the work list cannot be deleted.