MC_WriteLrealParameter

This function block is used to change the values of control system parameters. You can change the parameters of various control system components.

Notice

Only drive parameters can be changed (ParameterType:= 'Drive'). If you try to change other parameter types, it will result in an error message.

Block diagram

FB parameters

VAR_INPUT
Variable name	Data type	Description
Execute	BOOL	Must have the value TRUE in order to write the parameter value.
ParameterNumber	STRING	Identifier of the parameter to be written.
ParameterType	STRING	Kind of parameter to be written. Possible values: 'Drive'
Value	LREAL	New value of the parameter.
ParameterSetID	INT	Identifier indicating the parameter set in which the value is to be written. -1 at this input means that no parameter set was selected. The input is defaulted with this value.
SubdeviceID	INT	Identifier indicating the device for which the value is to be written. -1 at this input means that no unit was selected. The input is defaulted with this value.
WaitAck	BOOL	Input which influences the reaction of the motion controller to the command acknowledgement. TRUE – the motion controller stops the interpolation with this command. FALSE – the interpolation of the motion controller is not stopped when the command is received.

VAR_OUTPUT
Variable name	Data type	Description
Done	BOOL	Is TRUE when the parameter was successfully written.
Busy	BOOL	Is TRUE if the FB is still active.
Error	BOOL	Indicates whether an error occurred in the FB.
ErrorID	WORD	Error identifier
InternalErrorID	UDINT	Internal error identification of the ISG-MCP.

Behaviour of the FB:

A frequent cause of ISG-MCP errors are absent write privileges or a write-protected work list or original list because, in these cases, a work list is not created or an original list cannot be replaced.