MC_ReadActVel

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Function Block A function block groups an algorithm and a set of private data. It has inputs and outputs. - Reads the actual velocity of the axis.

Inputs

Input	Data Type	Range	Unit	Default	Description
Enable	BOOL	0, 1	N/A	No default	Request to read the axis's actual velocity.
Axis	AXIS_REF	1, 256	N/A	No default	Name of a declared instance of the AXIS_REF library function. See Axis Name and Number for more information. See AXIS_REF Structure for more information.

Input

Data Type

Range

Unit

Default

Description

Enable

BOOL

0, 1

N/A

No default

Request to read the axis's actual velocity.

Axis

AXIS_REF

1, 256

N/A

No default

Name of a declared instance of the AXIS_REF library function.

See Axis Name and Number for more information.
See AXIS_REF Structure for more information.

Outputs

Output	Data Type	Unit	Description
Valid	BOOL		Indicates the value at the ActualVelocity output is available.
Busy	BOOL		Indicates this function block is executing.
Error	BOOL		Indicates an invalid input was specified.
ErrorID	INT		Indicates the error if Error output is TRUE. See PLCopen Function Block ErrorIDs for more information.
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 for more information.

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

Figure 6-215: 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