MC_Power

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Function Block - Requests to either enable the drive and close the loop, or disable the drive and open the loop.

See Function Blocks - General Rules about how inputs and outputs work.
The Status output indicates the state of the position loop.
- If the position loop is open, the axis command position is set to the actual position of the axis and tracks the actual position.

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

- Be careful if there is more than one instance of MC_Power FB for the same drive, scanned in the same cycle.
- The problem arises when one instance requests the drive to enable and the other requests the same drive to disable.
- To avoid this trap, it is recommended to have only one instance of MC_Power for all active programs.

Inputs

Input	Data Type See Data Types.	Range	Unit	Default	Description
Enable	BOOL	FALSE, TRUE	N/A	No default	When this transitions goes to high: The control closes the servo loop. Sends a command to the drive to enable. When this transitions go to low: The control opens the servo loop. Sends a command to the drive to disable.
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.
EnablePositive	BOOL	FALSE, TRUE	N/A	No default	Unused.
EnableNegative	BOOL	FALSE, TRUE	N/A	No default	Unused.
BufferMode	SINT	0 (zero)	N/A	No default	Unused.

Outputs

Output	Data Type See Data Types.	Range	Unit	Description
Status	BOOL	FALSE, TRUE	N/A	Indicates the enabled/disabled state of the drive.
Busy	BOOL	FALSE, TRUE	N/A	Always FALSE.
Error	BOOL	FALSE, TRUE	N/A	Indicates an invalid input was specified.
ErrorID	INT	Enumerated	N/A	Indicates the error if Error output is TRUE. See PLCopen Function Block ErrorIDs.

FBD Language Example

Not available.

FFLD Language Example

IL Language Example

Not available.

ST Language Example

(* MC_Power ST example *)
Inst_MC_Power( CloseLoopReq, Axis1, TRUE, TRUE, 0 );
//Inst_MC_Power is an instance of MC_Power function block
DriveIsOn := Inst_MC_Power.Status;     //store the Status output into a user defined variable