Y_CA_RotaryKnifeCamGen

This function block is a user customizable function block that can produce BlendData based on provided knife parameters. With the main input variables populated, this function block will populate the 'KnifeParameters' VAR_IN_OUT structure and generate appropriate 'BlendData' for three cams (Ramp In, Running and Ramp Out). These cam tables will all have the same resolution, as set in the CamResolution variable.

Parameters

*	Parameter	Data Type	Description	Default
VAR_IN_OUT
B	KnifeParameters	Yt_CA_RotaryKnifeStruct	Structure generated that stores in inputed knife parameters and is used in further function blocks such as Y_CA_RotaryKnife
B	BlendData	Yt_CA_BlendStruct	Structure generated that stores the blend data of the cam profile
VAR_INPUT
B	Execute	BOOL	Upon the rising edge, all other function block inputs are read and the function is initiated. To modify an input, change the value and re-trigger the execute input.	FALSE
B	PartLength	LREAL	Average distance between each incoming part. Measured from the starting edge of the part to the starting edge of the next part.	LREAL#0.0
B	KnifeDiameter	LREAL	Diameter of the knife. Measured in master conveyor user units.	LREAL#0.0
B	NumberOfKnives	LREAL	Number of knives on the slave	LREAL#0.0
B	SpeedMatchStartAngle	LREAL	Start of the speed match zone of the knife. As reference SpeedMatchStartAngle > SpeedMatchEndAngle	LREAL#0.0
B	SpeedMatchEndAngle	LREAL	End of the speed match zone of the knife. As reference SpeedMatchStartAngle > SpeedMatchEndAngle	LREAL#0.0
B	CamResolution	REAL	Resolution of the Cam.	REAL#0.1
B	ReversibleCam	BOOL	Set TRUE if the Cam is mean't to be run in reverse as well.	FALSE
VAR_OUTPUT
B	Done	BOOL	Set high when the commanded action has completed successfully. If another block takes control before the action is completed, the Done output will not be set. This output is reset when Execute goes low.
B	Busy	BOOL	Set high upon the rising edge of the Execute input, and reset when Done or Error is true. In the case of a function block with an Enable input, a Busy output indicates the function is operating, but not ready to provide Valid information. (No Error)
E	Error	BOOL	Set high if an error has occurred during the execution of the function block. This output is cleared when Execute goes low.
E	ErrorID	UINT	If Error is true, this output provides the Error ID. This output is reset when Execute goes low.

Notes

This function block is meant to be used to generate blend data and KnifeParameters for theY_CA_RotaryKnife and #40879 function blocks.

Error Description

See the Function Block Function Block ErrorID List list.

Example

The figure below shows valid inputs for the function block.

Note that the CamIDs are the only elements of the 'BlendData' structure that are populated by the function block. The other elements of the 'BlendData' structure can be populated by the user based on application requirements.

The Knife Parameters are also populated by the Y_CA_RotaryKnifeCamGen function block. This structure can be used in the Y_CA_RotaryKnife_Registration FB.

When generating cams with this function block a a few common errors are as follows.

Error Code	Description
10180	SpeedMatchLengthError: PartLength <= SpeedMatch Length.
10181	SpeedMatchLimitError: SlaveCycle <= SpeedMatch Start angle.
10182	Speed Match Range Error: SpeedMatch start angle <= SpeedMatch end angle.
10190	Part Length Error: PartLength input must be greater than zero.
10191	Speed Match Distance Negative: The SpeedMatchDistance input must be greater than zero.
10192	Master Speed Match Position Negative: The MasterSpeedMatchStartPosition must be greater than zero.
10193	Speed Match Length Error: The PartLength must be > SpeedMatchDistance.

Input knife details such as part length, diameter, number of knives, start of speed match region and end of speed match region. This function block assumes that the home position for different number of knives is as follows:

The cut positions for the knife configurations shown above are as shown below.

Upon successful execution, generates three cam profiles: Ramp In, Running, and Ramp Out.

Knives	Ramp In		Running		Ramp Out
	Master	Slave	Master	Slave	Master	Slave
1	0 to Part Length	180 to 360	0 to Part Length	0 to 360	0 to Part Length	0 to180
2	0 to Part Length	90 to 180	0 to Part Length	0 to180	0 to Part Length	0 to 90
3	0 to Part Length	60 to 120	0 to Part Length	0 to120	0 to Part Length	0 to 60
4	0 to Part Length	45 to 90	0 to Part Length	0 to 90	0 to Part Length	0 to 45

A Ramp In, Running and Ramp Out series is shown below. The Running cam shown below corresponds to the unique case where part length equals the knife circumference which yields a straight line relationship. (In most applications, there will be a formula applied to keep the knife in sync with each product.)