SKP_SlitterAutomaticKnifePositioning (FB)

FUNCTION_BLOCK SKP_SlitterAutomaticKnifePositioning

This application is used for the automatic positioning knife part of the slitting machine. By driving the mechanical device through a servo motor, the knives are arranged to achieve the goal of automatic positioning knife arrangement. Compared to traditional manual positioning knife, automatic positioning knife can greatly improve production efficiency.

• Knife arrangement mechanism

  The Knife arrangement mechanism includes a latch, a cylinder, and a servo motor. The cylinder is used to drive the latch to lock and release the knife, while the servo motor is used to drive this kinfe arrangement mechanism to position the knife.

• Zero Point

  Mechanical zero point of servo motor, reference point for all dimensions.

• LeftWasteEdge

  Left waste width input by the user.

• RightWasteEdge

  Right waste width input by the user

• MaterialWidth[n]

  The width of each required cutting material entered by the user.

• Servo motor guide rail

  The rack guide rail for the operation of the cutting servo motor is connected to it through gears.

• Knife

  The cutting tool used for cutting materials is generally made of metal material.

• Knife holder

  The knife is installed on the knife base, and there are also two cylinders installed on the knife base, one for locking and releasing the knife, and the other for lifting and lowering the knife.

• Knife holder guide rail

  The guide rail used to fix the knife holder can be moved through the guide rail.

• Feed roller

  Power rollers for material conveying, used to pull materials.

Note

• For the MaterialWidth array, it take effect from MaterialWidth[2].

• If the LeftWasteEdge is zero, the function block will not select a knife to cut the last LeftWasteEdge.

• If the RightWasteEdge is zero, the function block will not select a knife to cut the last MaterialWidth.

• For left to right mode,after a successful positioning for each knife,function block will recalculate the target position for next one, if this position can’t be reached,function block will report error.

InOut:

Scope	Name	Type	Initial	Comment
Input	Execute	BOOL		Starts the function block at rising edge
	KnifeMoveVel	LREAL		Mechanical and knife move together at this velocity.unit:mm/s
	KnifeSearchingVel	LREAL		Mechanical to search knife at this velocity.unit:mm/s*
	BackParkPosVel	LREAL		Mechanical back to home position at this velocity.unit:mm/s
	KnifeAcc	LREAL		Acceleration for positioning knife velocity.unit:mm/s°°2
	KnifeDec	LREAL		Deceleration for positioning knife velocity.unit:mm/s°°2*
	EPCOffset	LREAL		The overall offset of the material relative to the home position.unit:mm
	KnifeSelectionMode	INT	2	1:Left to right mode, The function block will select the kinfe from left to right according to the material width.2: Best path mode,The function block will calculate the shortest path for the servo motor to move based on the material width to select the knife.
	KnifeDownMode	BOOL		Mode of knife go down,False=manual ,True=auto
	KnifeNumber	INT		Number of all knives.must >=3 and <= 99
	KnifeSpaceMin	LREAL		Minimum safty space between two knives.unit:mm
	ParkPosition	LREAL		When procress is done,mechanical back to this position.unit:mm
	KnifeHolderWidth	LREAL		End position of knife,it is used to determine whether all material lengths are legal.unit:mm
	EPCLimit	LREAL		High limitation for edge position controller
	LeftLimitSwitch	BOOL		Left limit hardware switch of Mechanical
	RightLimitSwitch	BOOL		Right limit hardware switch of Mechanical
	KnifeLimitHigh	ARRAY [1..99] OF LREAL		Upper limit of each knife travel.unit:mm.
	KnifeLimitLow	ARRAY [1..99] OF LREAL		Lower limit of each knife travel.unit:mm
	LeftWasteEdge	LREAL		Left waste edge width.unit:mm
	RightWasteEdge	LREAL		Right waste edge width .unit:mm
	MaterialWidth	ARRAY [1..99] OF LREAL		The cutting width of each section of material input by the user.unit:mm
	KnifeInitialPosition	ARRAY [1..99] OF LREAL		The initial position of each knife at the start of the process
	KnifeOffsetPosition	ARRAY [1..99] OF LREAL		Fine adjustment value for each blade position
	KnifeEnabled	ARRAY [1..99] OF BOOL		Available status of each kinfe, true means this knife can be selected and vice versa
	KnifeLockPosition	ARRAY [1..99] OF BOOL		The locking position of knife feedback from the sensor
	KnifeUnLockPosition	ARRAY [1..99] OF BOOL		The unlocking position of each knife feedback from the sensor
	KnifeUpPosition	ARRAY [1..99] OF BOOL		The up position of each knife feedback from the sensor
	KnifeDownPosition	ARRAY [1..99] OF BOOL		The down position of each knife feedback from the sensor
	KnifeCheckSensor	BOOL		The sensor feedback detects the kinfe signal
	LatchUpPosition	BOOL		The up position of the latch feedback from the sensor
	LatchDownPosition	BOOL		The down position of the latch feedback from the sensor
	CylinderActionDelayTime	DINT	500	Cylinder action delay time.unit:ms
Output	Done	BOOL		Shows the status of the function block. Done = TRUE if the execution is finished
	Busy	BOOL		Shows the status of the function block. TRUE when the instruction is acknowledged.
	Active	BOOL		True when the axis is being controlled.
	CommandAborted	BOOL		Command is aborted by another command from other PLCopen function block
	Error	BOOL		Signals that error has occurred within function block
	ErrorID	AC500_MotionControl.ERROR_ID	AC500_MotionControl.ERROR_ID.MC_Ok	Contains the error code when there is an error.
	AppErrorID	ERROR_ID		Error identification. For error details refer to Enumeration ERROR_ID
	ExtendLatch	BOOL		Lever cylinder extend to take the knife
	RetractLatch	BOOL		Lever cylinder retract
	KnifeSelection	ARRAY [1..99] OF BOOL		Selection status of each knife,True=selected,False=Not be selected
	KnifeLock	ARRAY [1..99] OF BOOL		Output signal of locking cylinder
	KnifeUnLock	ARRAY [1..99] OF BOOL		Output signal of unlocking cylinder
	KnifeUp	ARRAY [1..99] OF BOOL		Output signal of knife up cylinder
	KnifeDown	ARRAY [1..99] OF BOOL		Output signal of knife down cylinder
	KnifeActualPosition	ARRAY [1..99] OF LREAL		Actual position of knife when positioning knife process is done
	TotalTime	TIME		Total time for the whole process
	KnifeCylinderActionError	ARRAY [1..99] OF BOOL		Knife cylinder action error
Inout	Axis	Axis_Ref		Reference to axis

Structure:

• SKP_SlitterAutomaticKnifePositioning.KnifePositioning (ACT)
• SKP_SlitterAutomaticKnifePositioning.zAction (ACT)