MC_ReadParam

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 Function Block - Returns the value of the specified axis parameter.

Inputs

Input

Data Type

Range

Unit

Default

Description

Enable

BOOL

FALSE, TRUE

N/A

No default

Request to read the axis parameter.

Axis

AXIS_REF

1 to 256

N/A

No default

Name of a declared instance of the AXIS_REF library function.

ParameterNumber

INT

-32768 to +32767

N/A

No default

Parameter number.

See Axis Parameters.

Outputs

Output

Data Type

Range

Unit

Description

Valid

BOOL

FALSE, TRUE

N/A

Indicates the Value output is valid.

Busy

BOOL

FALSE, TRUE

N/A

Indicates this function block is executing.

Error

BOOL

FALSE, TRUE

N/A

Indicates an invalid input was specified.

ErrorID

INT

-32768 to +32767

 

Indicates the error if Error output is TRUE.

See PLCopen Function Block ErrorIDs.

Value

LREAL

 

 

Value of the parameter.

Remarks

Returns the value of a drive parameter.

  • The returned value has to be converted to REAL if required.
  • If not possible, the vendor must provide a supplier-dependent FB for it.

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

Figure 1: MC_ReadParam

FBD Language Example

Not available.

FFLD Language Example

IL Language Example

Not available.

ST Language Example

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