MC_ReadActVel

 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. See Axis Name and Number. See AXIS_REF Structure.

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

• 
  

• This function or function block returns cached data.
  See Program a Multi-Core Controller.

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