MCV_ReadParamValue

Read parameter value

The parameter values from the original list or work list of a selected parameter set can be read with this function block. If the parameter sought is in the always-existing original list, it is returned as the "old parameter". If a work list exists and contains the parameter value, it is returned as the "new parameter".

CAUTION
· The parameter value effective in the controller may differ from the two parameter values read in if the parameter value has been corrected in the controller due to a warning when interpreting the original or work list.· After activation without a warning, the parameter value of the work list is active in the controller. Otherwise, it is the value of the original list.

Block diagram

Parameters of the FB

VAR_IN_OUT
	Axis	AXIS_REF	Axis reference.
VAR_INPUT
	Execute	BOOL	Reading of parameter value at rising edge.
	NCListTypeIn	STRING	Identification of parameter or list type, e.g. ACHS_MDS.
	NCParamSetIDIn	UINT	Number of parameter set from which the parameter value is to be read.
	NCParamIdentIn	STRING	Identification of the parameter to be read, e.g. kenngr.swe_pos.
VAR_OUTPUT
	Valid	BOOL	Indicates if the parameter value has been read 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 from which the parameter value has to be read or has been read.
	NCParamIdentOut	STRING	Identification of the parameter, e.g. kenngr.swe_pos.
	NCOldParamValueRead	BOOL	Indicates if the parameter identification could be found in the original list.
	NCOldParamValueOut	STRING	Parameter value from the original list.
	NCNewParamValueRead	BOOL	Indicates if the parameter identification could be found in the working list.
	NCNewParamValueOut	STRING	Parameter value from the working list.
	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 value could not be read 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.
The ISG-MCP returns an error if the parameter value cannot be found in any of the lists.