MCV_ChgParamValue

Change parameter value

With this function block, a parameter is written into the work list of the specified parameter set. This parameter set need not correspond to the active one. When a parameter is changed in a parameter set for the first time, a copy of the original list is created as the work list.

CAUTION
The modified parameters of the work list are not accepted by the ISG-MCP, and do not take effect, until after activation with the MCV_ActivateParamChg function block.

Block diagram

Parameters of the function block

VAR_IN_OUT
	Axis	AXIS_REF	Axis reference.
VAR_INPUT
	Execute	BOOL	Change of parameter value at rising edge.
	NCListTypeIn	STRING	Identification of parameter or list type, e.g. ‘ACHS_MDS’.
	NCParamSetIDIn	UINT	Number of parameter set in which the value is to be changed.
	NCParamIdentIn	STRING	Identification of the parameter to be changed, e.g. ‘kenngr.swe_pos’.
	NCParamValueIn	STRING	New value of the parameter.
VAR_OUTPUT
	Valid	BOOL	Indicates if the change of the parameter has been successful.
	Busy	BOOL	Indicates if the function block is still busy.
	nc_list_type_out	STRING	Identification of parameter or list type, e.g. ‘ACHS_MDS’.
	NCListTypeOut	UINT	Number of parameters set in which the parameter value should have been changed or is changed.
	NCParamSetIDOut	STRING	Identification of the parameter to be changed, e.g. ‘kenngr.swe_pos’.
	NCParamIdentOut	STRING	New value of the parameter.
	NCParamValueOut	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. Change of parameter set is not executed.
	ErrorID	WORD	Error identification.

Behavior of the function block

The function block is in an error state if ‘Error’ = TRUE. The parameter has not been written to the work list. 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, a work list is not created, or a parameter cannot be written.