MC_ReadActVel

PLCopen motion icon

 Function Block - Reads the actual velocity 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 velocity.

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 ActualVelocity 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.

ActualVelocity

LREAL

 

User unit/sec

Actual velocity of the axis.

Oscillations may be seen because this is an instant velocity, not an average velocity.

Remarks

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

Figure 1: MC_ReadActVel

FBD Language Example

Not available.

FFLD Language Example

IL Language Example

Not available.

ST Language Example

            * MC_ReadActVel S
            T example *);
Inst_MC_ReadActVel( TRUE, Axis1 ); //Inst_MC_ReadActVel is an instance of MC_ReadActVel function block
			
ActualVel := Inst_MC_ReadActVel.ActualVelocity; // store ActualVelocity output into a user defined variable