MCV_ChgParamValue

Change parameter value

To prevent problems caused by incorrect parameterisation, this block does not change the original parameter set but creates a copy and writes the changes to it. This copy is referred to the work list in this documentation.

The original parameter set need not correspond to the currently active parameter data record. It is selected by specifying its code at the ”NcParamSetIDIn” input.

Notice

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.

Blockdiagramm

Parameters of the FB

VAR_IN_OUT
Variable name	Data type	Description
axis	AXIS_REF	Axis reference

VAR_INPUT
Variable name	Data type	Description
Execute	BOOL	A change in a parameter value is executed on the rising edge.
NCListTypeIn	STRING	Identifier for parameter or list type e.g. "ACHS_MDS"
NCParamSetIDIn	UINT	Number of the parameter set in which the parameter value is to be changed.
NCParamIdentIn	STRING	Code of the parameter to be changed e.g. "kenngr.swe_pos"
NCParamValueIn	STRING	New value of the parameter.

VAR_OUTPUT
Variable name	Data type	Description
Valid	BOOL	Is TRUE when the change in parameter value was successful.
Busy	BOOL	Is TRUE when the FB is still active.
NCListTypeOut	STRING	Identifier for parameter or list type e.g. "ACHS_MDS"
NCParamSetIDOut	UINT	Number of the parameter set in which the parameter value was/is to be changed.
NCParamIdentOut	STRING	Code of the parameter to be changed e.g. "kenngr.swe_pos"
NCParamValueOut	STRING	New value of the parameter.
NCWarning	BOOL	Is TRUE if a warning occurs in the ISG-MCP.
NCError	BOOL	Is TRUE when an error occurs in the ISG-MCP during a change in parameter value.
NCErrorCode	UDINT	Error code of the error or warning occurring in the ISG-MCP.
Error	BOOL	Is TRUE if the FB is in error state. The change in parameter set was not executed successfully.
ErrorID	WORD	Error code.

¹) Availability is dependent on the MCE used.

Behaviour of the FB

The FB 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.