MC_ReadActPos

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 Function Block - Reads the actual position of the axis.

Inputs

Input

Data Type

Range

Unit

Default

Description

Enable

BOOL

FALSE, TRUE

N/A

No default

Request to read the axis's actual position.

Keeps continuously reading the actual position every PLC cycle, as long as the Enable remains high.

Axis

AXIS_REF

1 to 256

N/A

No default

Name of a declared instance of the AXIS_REF library function.

Outputs

Output

Data Type

Range

Unit

Description

Valid

BOOL

FALSE, TRUE

N/A

Indicates the value at the Position output is available.

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.

Position

LREAL

 

User units

Actual position of the axis.

Remarks

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

Figure 1: MC_ReadActPos

FBD Language Example

Not available.

FFLD Language Example

IL Language Example

Not available.

ST Language Example

            (* MC_ReadActPos S
            T example *)
Inst_MC_ReadActPos( TRUE, Axis1 );
//Inst_MC_ReadActPos is an instance of MC_ReadActPos function block

ActualPos := Inst_MC_ReadActPos.Position; 
//store Position output into a user defined variable