MC_ReadParam

Description

The MC_ReadParam function block returns the value of the specified axis parameter.

Figure 7-132: MC_ReadParam

• 
  

• This function or function block returns cached data.
  See Programming a Dual Core Controller for more information.

Arguments

See Function Blocks - General Rules for more information about how inputs and outputs work.

Input

Enable	Description	Requests to read the axis parameter
	Data type	BOOL
	Range	0, 1
	Unit	N/A
	Default	—
Axis	Description	Name of a declared instance of the AXIS_REF library function. See Axis Name and Number for more information.
	Data type	AXIS_REF
	Range	[1,256]
	Unit	N/A
	Default	—
ParameterNumber	Description	Parameter number, see the table in Axis Parameters.
	Data type	INT
	Range	—
	Unit	N/A
	Default	—

Output

Valid	Description	Indicates the Value output is valid
	Data type	BOOL
Busy	Description	Indicates this function block is executing
	Data type	BOOL
Error	Description	Indicates an invalid input
	Data type	BOOL
ErrorID	Description	Indicates the error if Error output is set to TRUE See the table in PLCopen Function Block ErrorID Output.
	Data type	INT
Value	Description	Value of the parameter
	Data type	LREAL

Example

Structured Text

            (* MC_ReadParam ST example *)
Inst_MC_ReadParam( EnableRead, Axis1, MC_AXIS_PARAM_CMD_VEL );
Axis1_CmdVel := Inst_MC_ReadParam.Value; 

Ladder Diagram

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