MC_MarkRegist

Description

This function block enables mark-to-mark registration and can be used on any servo or digitizing axis and with any move type. This function block is most frequently used in master/slave applications.

Used with ...	Effect
Non-slave moves	Resets the axis position when a good mark is captured by the fast inputThe inputs are taken into account at each cycle depending on the system periodicity (for example each millisecond). Under certain circumstances this can be insufficient when more accuracy is needed, or if a quick response is required from the system. To fill the gap, a drive may have some Fast Input connections (generally one or two). When an event happens that triggers a Fast Input (e.g. when a sensor sends a rising edge), the detection of a signal occurs faster (which can be 1000 times more accurate than the system periodicity). Then the timestamp associated with this input can be provided to the IPC to take corrective action.
Slave moves	In addition to resetting the axis position, applies a compensation offset to correct for the difference between the target mark-to-mark distance and the measured mark-to-mark distance. This provides the ability to compensate for product or process inconsistencies providing a system that remains synchronized with no accumulated error and maintaining repeatable accuracy throughout the process.

Used with ...

Effect

Non-slave moves

Resets the axis position when a good mark is captured by the fast input

The inputs are taken into account at each cycle depending on the system periodicity (for example each millisecond). Under certain circumstances this can be insufficient when more accuracy is needed, or if a quick response is required from the system. To fill the gap, a drive may have some Fast Input connections (generally one or two). When an event happens that triggers a Fast Input (e.g. when a sensor sends a rising edge), the detection of a signal occurs faster (which can be 1000 times more accurate than the system periodicity). Then the timestamp associated with this input can be provided to the IPC to take corrective action.

Slave moves

In addition to resetting the axis position, applies a compensation offset to correct for the difference between the target mark-to-mark distance and the measured mark-to-mark distance. This provides the ability to compensate for product or process inconsistencies providing a system that remains synchronized with no accumulated error and maintaining repeatable accuracy throughout the process.

A positive transition of the En input will start registration. The application may change the registration parameters while registration is active by changing the input values and causing another positive transition of the En input. The function block will then read and apply the new values.
The axis number at the Axis input identifies the axis of registration. If Axis is a master axis for another axis’s slave move, Master Registration will be activated. Master Registration calculates a compensation that is added to the master offset of its slaves. This offset shifts the position of the master axis as seen by its slaves. The compensation is not applied to the master axis, but to its slaves. If Axis is a slave axis, Slave Registration will be activated. Slave Registration calculates a compensation that is added to the slave offset of the axis. This compensation value is applied directly to the slave axis.
The Distance, Tolerance, and Ignore inputs are used to determine whether or not the registration mark is good. For a mark to be recognized as good, it must be outside of the Ignore distance and the correct Distance from the previous mark +/- the Tolerance window. A mark is considered bad if it occurs outside of the “good tolerance band” and is not ignored. Both good marks and bad marks are recognized as marks, ignored marks are not recognized. If all marks are to be recognized as good marks, enter 0 at both Distance and Tolerance.
The Distance value defines the distance between good marks. In Clear Lane and Product registration the Distance input value typically is the same as the Target input value. However in Print registration the Distance is typically not the same as Target.
The Tolerance value is the distance, plus and minus, about Distance. Marks that are detected within this window are considered good marks and registration will occur. Marks that are detected outside this window and outside the Ignore band, are considered bad marks and registration will not occur. This window should be large enough to allow for the worst case error in the distance between the previous mark and the current mark.
The Ignore value defines the distance from the previous mark where all marks detected by the fast input will be ignored. This is crucial when registering products that do not have Clear Lane registration marks.
The Target input is the expected distance between good registration marks and is used to calculate how much registration compensation is to be applied when a registration mark is considered good. In many applications this is often equivalent to the product length or the cycle length. When a good mark is detected, the actual distance between the good mark and the previous mark is determined and compared to the Target distance to calculate a correction. The registration correction will only be applied with master/slave move types and always affects the slave axis.
The Position input is the position value that the registration Axis position will be reset to when a good registration mark is detected.
The Option input defines various modes of operation for registration. The first bit, 0001H, selects Absolute or Resetting. This refers to the way in which the second mark and all subsequent marks are determined to be good marks. With both registration schemes, the very first mark detected is the starting point. With Resetting registration, when the next mark is detected, the position of that mark becomes the starting point for the next good mark detection calculation and so on. The starting point is “reset” with each good or bad mark. This feature allows the product to re-synchronize, if necessary, due to process issues like product shift, etc. In contrast, Absolute registration determines all good marks based on the very first mark. The position of the second and each subsequent mark is compared to an integer multiple of Distance from the very first mark. This method insures the product will always register to a known fixed distance.

This function block starts a motion-related action and therefore stores data for calculations and error checking. Please see Calling Function Blocks Multiple Times in the Same Cycle if you are using a dual-core controller.

Is this the right function block to use? See Deciding Which Function Blocks to Use for Registration and Registration Application Guide.

Arguments

Input

En	Description	Rising edge of EN enables execution
	Data type	BOOL
	Range	0, 1
	Unit	N/A
	Default	—
Axis	Description	Axis to apply registration to
	Data type	AXIS_REF
	Range	The range of .AXIS_NUM is [1,256]
	Unit	N/A
	Default	N/A
TriggerInput	Description	Structure specifying the fast input. The structure elements are: InputID INT 0 = Touch Probe 1 / Capture Engine 0 1 = Touch Probe 2 / Capture Engine 1 Range is [0,1] DirectionINT 1 = rising edgeA rising edge is the transition of a digital signal from low to high. It is also called positive edge, 2 = falling edge, 3 = NA, 4 = toggle between both, falling edge first, 5 = toggle between both, rising edge first, range = [1,5] TrigIDINT Axis number of the fast input. Zero indicates this trigger axis is to be the same as the Axis input. range = [0,256] TrigMode INT (TriggerInput.TrigMode) is not presently supported by this function. The TriggerInput.Mode may be supported in a future software version.
	Data type	TRIGGER_REF
	Range
	Unit
	Default
Distance	Description	This is the expected distance between good marks. Along with Tolerance and Ignore, this value is used to determine if the mark detected by the fast input is a good mark.
	Data type	LREAL
	Range	When converted to feedback units, the range is [-2⁵¹,2⁵¹-1]. This value must have the same sign as Ignore.
	Unit	user units
	Default	N/A
Tolerance	Description	This value specifies the distance, plus or minus, about Distance to determine if the mark detected by the fast input is a good mark.
	Data type	LREAL
	Range	When converted to feedback units, the range is [0,2⁵¹-1]
	Unit	user units
	Default	N/A
Ignore	Description	This value specifies the distance after the previous good mark in which any detected marks are ignored.
	Data type	LREAL
	Range	When converted to feedback units, the range is [-2⁵¹,2⁵¹-1]. This value must have the same sign as Distance.
	Unit	user units
	Default	N/A
Target	Description	This is the target distance between good marks. This distance is compared to the actual distance measured by the fast input to determine the amount of registration compensation to apply.
	Data type	LREAL
	Range	When converted to feedback units, the range is [-2⁵¹,2⁵¹-1]. This value must have the same sign as Distance.
	Unit	user units
	Default	N/A
Position	Description	The position the axis is set to when a good registration mark occurs. If the “Inhibit Reference on Good Mark” option is specified for the Option argument (see Options Table below), then this argument is not used and the position of the axis is not changed when a registration mark is encountered.s
	Data type	LREAL
	Range	When converted to feedback units, the range is: [-2⁵¹,2⁵¹-1] if PosAxis' rollover value is zero [0, PosAxis' Rollover Value] if PosAxis' rollover value is non-zero (i.e., ≥ 0 < PosAxis' Rollover Value)
	Unit	user units
	Default	N/A
Options	Description	Each bit enables/disables an option. The following table defines the bits. Any bits not defined are reserved.
	Data type	UINT
	Range	Refer to the following options table.
	Unit	N/A
	Default	N/A

Hexadecimal	Decimal	Option	Description
0001 H	1	Absolute/Resetting	0 = Resetting, 1 = Absolute
0002 H	2	Reserved	0
0004 H	4	Time/position based capture	0 = time based capture, 1 = position based capture
0008 H	8	Inhibit Reference on Good Mark	0 = Perform reference, 1 = inhibit reference When this bit is set, the Position function block argument is unused and the axis position is not changed when a registration mark is encountered.
0010H	16	Inhibit Master Compensation	0 = Perform Master Compensation, 1 = Inhibit Master Compensation
0020H	32	Inhibit Slave Compensation	0 = Perform Slave Compensation, 1 = Inhibit Slave Compensation.

Table 7-43: MC_MarkRegist Options Table.

To use Capture Engine 1 modify the input PDOs that are used and add the LatchThe control word is used to activate the drive's latch status machine. The latch control word is processed independently of the EtherCAT bus cycle. The status word is used to return the drive's latch status Position 1 parameter.

Outputs

RegistOn	Description	Indicates that registration is active.
	Data type	BOOL
Aborted	Description	Indicates registration has been terminated by MC_StopRegist.
	Data type	BOOL
Error	Description	Indicates an invalid input was specified or registration was terminated due to an error
	Data type	BOOL
ErrorID	Description	Indicates the error if Error output is TRUE. See table in PLCopen Function Block ErrorID Output.
	Data type	INT

MC_MarkRegist

Description

Arguments

Input

Outputs

Related Functions

Examples

Function Block

Instruction List

Ladder Diagram

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