MC_ReadParameter

MC_ReadParameter 1:

The function block MC_ReadParameter is used to read an axis parameter.

	In this case "axis" refers to the TwinCAT NC axis and its parameters, and not the drive.

Inputs

VAR_INPUT
    Enable          : BOOL;      (* B *)
    ParameterNumber : MC_AxisParameter;       (* B *)
    ReadMode        : E_ReadMode (* V *)
END_VAR

Name	Type	Description
Enable	BOOL	Reads the parameter once or cyclically depending on the ReadMode.
ParameterNumber	MC_AxisParameter	Number of the parameter to be read
ReadMode	E_ReadMode	Read mode of the parameter to be read (once or cyclic)

Inputs/outputs

VAR_IN_OUT
    Axis : AXIS_REF;
END_VAR

Name	Type	Description
Axis	AXIS_REF	Axis data structure that unambiguously addresses an axis in the system. Among other parameters it contains the current axis status, including position, velocity or error state.

Outputs

VAR_OUTPUT
    Valid   : BOOL;  (* B *)
    Busy    : BOOL;  (* E *)
    Error   : BOOL;  (* B *)
    ErrorID : DWORD; (* E *)
    Value   : LREAL; (* B *)
END_VAR

Name	Type	Description
Valid	BOOL	Signals with TRUE that the value read at output Value is valid.
Busy	BOOL	TRUE as soon as the command is started with Enable and as long as the command is processed. If Busy is FALSE, the function block is ready for a new order.
Error	BOOL	TRUE, if an error occurs.
ErrorID	DWORD	If the error output is set, this parameter supplies the error number.
Value	LREAL	Shows the read value.

Requirements

Development environment	Target system type	PLC libraries to include
TwinCAT v3.0.0	PC or CX (x86 or x64)	Tc2_MC2