Topic: DMD0521

Help File Version: 2.10.0.636

CTAXDYNV - CTRIO2 Axis Run Dynamic Velocity Mode


This instruction can be used with the CTRIO2 module.

 

The CTRIO2 Axis Run Dynamic Velocity Mode (CTAXDYNV) instruction is used to put the Pulse Output Device into the Dynamic Velocity Mode, allowing successive velocities to be easily commanded. Once in Dynamic Velocity Mode, velocities are commanded by simply changing the Frequency value. The velocity moves will execute using the parameters defined by a previously executed Axis Configuration (CTAXCFG) instruction.

 

 


Parameters:

Note: Use the F9 key or click the 'three dot box' at the right edge of the parameter field to open the Default Element Selection Tool (the Element Picker or the Element Browser) or use the Down-Arrow key (Auto-Complete) on any parameter field to see a complete list of the memory locations that are valid for that parameter of the instruction.

 

Pulse Output Device - selects which preconfigured CTRIO Pulse Output device to use. Before this instruction can select a Pulse Output device, a CTRIO Device must be configured with at least one of its output channels setup for Pulse / Direction or CW / CCW pulse output mode.

no devices available - indicates that there are no CTRIO Pulse Output devices that have been configured that can perform this instruction.

 

create module - will open the Create New Module Configuration dialog where a CTRIO Module can be created and then a CTRIO Pulse Output device can then be configured.

Pulse Output Structure - this field displays the name of the Pulse Output Structure that will be used by this instruction. This structure was created when the CTRIO module was configured during the Module Configuration phase.

 


Frequency - specifies the frequency for the Dynamic Velocity Profile. The minimum output frequency is 20Hz, so any Frequency value between 0 and 20 will result in a 20Hz output signal. This can be any positive or negative constant value in the range of 0 to 250000, or any readable numeric location.

 


The On Success and On Error parameters specify what action to perform when this instruction completes. You do not have to use the same type of selection for both On Success and On Error.

 

If the Set Bit selection is used for either On Success or On Error, the specified BIT location will be SET OFF when the instruction is first enabled and will remain OFF until the instruction completes. Once complete, the appropriate Success or Error bit location ON. The specified Bit location is enabled with a SET (Latch) operation meaning that it will remain ON even if the input logic for the instruction goes OFF.

 

If the JMP to Stage selection is used for either On Success or On Error the target Stage must be in the same Program code-block as this instruction, you cannot specify a target Stage that exists in a different Program code-block. When the operation finishes, the target Stage will be enabled the same way as a standalone Jump to Stage (JMP) instruction would do it. The JMP to Stage option will only be available if this instruction is placed in a Program code-block.

 

On Success selects which of the following actions to perform if the operation is successful:

  • Enable SET Bit then specify any writable bit location.
  • Enable JMP to Stage then specify any Stage number from S0 to S127 in the current Program code-block.

 

On Error selects which of the following actions to perform if the operation is unsuccessful:
 

  • Enable SET Bit then specify writable bit location.
  • Enable JMP to Stage then specify any Stage number from S0 to S127 in the current Program code-block.

 

If either the On Success or On Error selections are set to JMP to Stage, Automatically create the SG box for any NEW stage number will be enabled which will automatically create any target stage that does not already exist.

  • Below this rung will create the new target stage on a new rung following this instruction.
  • At end of code-block will create the new target stage as the last rung of this Program.

 

Note: On Success is not indicated upon the every Frequency value change. While the Enable / Reset input is ON, the Pulse Output Device is considered in the "Dynamic Velocity Mode". When the Enable / Reset input goes OFF the On Success indication is made.

 

Note: any time the On Error condition occurs, the CTRIO generates an Error Code that can be read in the <Module Name>.ErrorCode (Module Name is the name assigned to the CTRIO in the Module Configuration). The List of Error Code values (in decimal) follows:

 

Error Code

Description

000

No Error

100

Specified command code is unknown or unsupported

101

File number not found in the file system

102

File type is incorrect for specified output function

103

Profile type is unknown

104

Specified input is not configured as a limit on this output

105

Specified limit input edge is out of range

106

Specified input function is unconfigured or invalid

107

Specified input function number is out of range

108

Specified preset function is invalid

109

Preset table is full

110

Specified Table entry is out of range

111

Specified register number is out of range

112

Specified register is an unconfigured input or output

113

Specified output is not configured as a limit on this output

114

Specified preset function invalid in PLS table

115

Specified PLS function invalid in preset table

116

PLS table entries overlap

117

Attempted to use axis function when pulse output is not in Axis Mode

118

Specified output isn't a pulse output

 


Instruction Inputs:

 

The first input (E/R) in the Enable / Reset input. When this input logic is ON the Pulse Output Device is placed in the "Dynamic Velocity Mode" and the Output will be enabled (.OutputEnabled = ON).

 

The second input (SUS) is the Suspend input.

When this input logic transitions ON, the CTRIO2 will ramp down to zero using the Deceleration Rate specified in the Axis Configuration (CTAXCFG). Click here for more information on the Axis Configuration instruction. No additional pulses will be emitted as long as this input remains ON.

When this input logic transitions, OFF the CTRIO2 will ramp up to the Maximum Frequency using the Acceleration Rate specified in the Axis Configuration (CTAXCFG). Click here for more information on the Axis Configuration instruction. 

 

 


Status Display:

 

The status display of the instruction shows Values: .OutputVelocity, .OutputPosition, and Frequency, and Highlight: .OutputEnabled, .OutputActive, .OutputSuspended, .OutputStalled, and .AtVelocity bits.

 

The red triangle in the upper left corner of the status display indicates this is a Fully Asynchronous instruction.

 


CTRIO2 Structure Field Care-Abouts:

The following is a list of the"dot" fields of the CTRIO2 structure that are programmatically used with the CTRIO2 Axis Run Dynamic Velocity Mode (CTAXDYNV) instruction. To see a complete listing of all CTRIO structures and members, go to the Project Browser --> Configuration --> Memory --> I/O --> Specialty.

 

COLOR KEY

Blue: CTRIO2 Input

Maroon: CTRIO2 Output

Black: CTRIO2 Module

Silver: Not used for this instruction

 

Note: The red "x" is the digit 0, 1, 2, or 3.

 

CTRIO_000

CTAXDYNV

MEMBER

R/W

TYPE

DESCRIPTION

_CxFx.AtResetValue

RO

Bit

ON if CxFx count is at reset value

_CxFx.CaptureComplete

 

 

 

_CxFx.CapturedStart

 

 

 

_CxFx.CountCaptured

 

 

 

_CxFx.EnableCapture

 

 

 

_CxFx.fReg1

RO

Dword

If floating-point scaling is configured for CxFx in CTRIO2: Floating-point scaled value; otherwise, number has no meaning

_CxFx.fReg2

 

 

 

_CxFx.iReg1

RO

Dword

If integer or BCD scaling is configured for CxFx in CTRIO2: Signed-integer or BCD scaled value; otherwise, signed-integer raw count

_CxFx.iReg2

RO

Dword

If any scaling is configured for CxFx in CTRIO2: Signed-integer raw count; otherwise, number has no meaning

_CxFx.Output

 

 

 

_CxFx.Reset

R/W

Bit

Set ON to reset CxFx count

_CxFx.Timeout

 

 

 

_Outx.AtPosition

 

 

 

_Outx.AtVelocity

RO

Bit

ON when CTRIO2 has reached Frequency

_Outx.Direction

RO

Bit

ON when motor is moving counter-clockwise

_Outx.EnableOutput

 

 

 

_Outx.GotoPosition

 

 

 

_Outx.Output

 

 

 

_Outx.OutputActive

RO

Bit

ON when CTRIO2 output is generating pulses

_Outx.OutputEnabled

RO

Bit

ON when E/R input comes ON which enables CTRIO2 output

_Outx.OutputPosition

RO

Dword

CTRIO2 output raw position (or encoder feedback position if CTAXCFG is configured as such)

_Outx.OutputStalled

RO

Bit

ON if CTRIO2 output cannot generate pulses because its scan time is too high

_Outx.OutputSuspended

RO

Bit

ON when the SUS input comes ON which suspends the CTRIO2 output

_Outx.OutputVelocity

RO

Dword

Current pulses per second rate being output by the CTRIO2

_Outx.TableComplete

 

 

 

.ErrorCode

RO

Word

Last CTRIO2 error code

.Mode

RO

Word

Indicates CTRIO2 mode: 2 = RUN; 1 = PROGRAM

.ScanTime

RO

Word

CTRIO2 scan time in microseconds

.MaxScanTime

RO

Word

Maximum CTRIO2 scan time in microseconds

.InputState

RO

Word

Upper byte is not used. Lower byte's nibbles indicate CTRIO2's channel's input's state in order: .ChxD, .ChxC, .ChxB, .ChxA. It is a composite of these members

.OutputState

RO

Word

Each nibble indicates a CTRIO2 output configuration and state: .OutxType, .OutxDiscOn, .OutxDiscEnabled, .OutxPulseActive. It is a composite of these members

.ChxA

RO

Bit

ON when CTRIO2 Channel x Input A is ON

.ChxB

RO

Bit

ON when CTRIO2 Channel x Input B is ON

.ChxC

RO

Bit

ON when CTRIO2 Channel x Input C is ON

.ChxD

RO

Bit

ON when CTRIO2 Channel x Input D is ON

.OutxType

RO

Bit

Configuration: ON if CTRIO2 output x is configured for pulse output

.OutxDiscOn

RO

Bit

Status: ON if CTRIO2 output x logic is ON (if output x is enabled then the physical output will also be ON)

.OutxDiscEnabled

RO

Bit

Configuration: ON if CTRIO2 output x is configured for discrete output

.OutxPulseActive

RO

Bit

Status: ON if CTRIO2 output x is generating pulses

 

NOTES:

(1)This structure member only available for CTRIO2 (not CTRIO). For CTRIO this remains zero.

 


See Also:

CTRIO2 Axis Configuration

 

CTRIO2 Axis Run Dynamic Position Mode


CTRIO2 Axis Run Dynamic Velocity Mode


CTRIO2 Axis Run Trapezoid


CTRIO2 Axis Run Trapezoid w/ Limits


CTRIO2 Axis Jog Mode

 


Example 1 of 2:

Description of a Typical CTRIO2 Axis Run Dynamic Velocity Mode (CTAXDYNV) Stage Diagram:

This is a stage diagram of a simple sequence control that would run a motor at any number of different velocities.

 

 

Initially the Config stage waits for Configure to come ON. When it does, the CTRIO2 axis is defined and the process transitions to the Velocity stage.

 

The Velocity stage puts the CTRIO2 pulse output in the Dynamic Velocity mode. Once this is complete (OutEn = ON) then the RunVel stage is enabled (not transitioned to). The reason for this is because the Velocity stage must be left enabled to keep the CTRIO2 pulse output in the Dynamic Velocity mode through the whole process.

 

In the RunVel stage exists ladder logic that would write any number of velocity values as needed for the process. When the last velocity has finished, then Done comes on and it transitions to the Stop stage where the Program code block is exited.

 


Description of a Typical CTRIO2 Axis Run Dynamic Velocity Mode (CTAXDYNV) Stage Ladder:

This is the ladder equivalent of the above stage diagram that uses the CTAXDYNV instruction which will run a stepper motor attached to the CTRIO2's pulse output at any number of velocities using a movement profile that is defined by the CTAXCFG instruction. Click here for more information on the CTAXCFG instruction.

 

This example presupposes the existence of the following System Configuration for the CTRIO2 (PLC --> System Configuration --> Module Configuration(s) --> CTRIO_000 -->):

  • Configure I/O... --> Outputs --> Out0 --> Pulse (Step/Dir) or Pulse (CW/CCW).

  • A stepper motor is wired to CTRIO2's Output 0 and Output 1.

 

 

Config is the initial stage and waits for the input Configure bit to come ON. When it does the CTRIO2 axis is configured using the CTAXCFG instruction. If there is an error then transition is made to the ErrorStage stage where ladder logic should exist (not shown here) that would properly handle the error (e.g. to process the $CTRIO_000.ErrorCode value). If the configuration was successful, then transition is made to the Velocity stage.

 

Velocity stage is the main CTAXDYNV instruction stage. This stage must remain enabled during the entire velocity process. When VelocityEnable bit comes ON the following happens:

  1. The Pulse Output Device ($CTRIO_000_Out0) will be placed in the "Dynamic Velocity Mode."

  2. The CTRIO2's Pulse Output is enabled ($CTRIO_000_Out0.OutputEnabled = ON).

  3. The CTRIO2 output will start accelerating toward the value stored in the Speed variable.

 

The VelocityEnable must be reset OFF when all velocities are completed.

 

Note: Turning VelocityEnable bit OFF will cause the CTRIO2 output to abruptly stop generating pulses. Thus it is usually a good idea to either enable Suspend bit so that the CTRIO2 output decelerates to zero velocity or write a zero (0) to the CTAXDYNV's Frequency parameter (Speed) before turning VelocityEnable bit OFF.

 

When VelocityEnable comes ON, if there is an error then transition is made to the ErrorStage stage where ladder logic should exist (not shown here) that would properly handle the error (e.g. to process the $CTRIO_000.ErrorCode value). If there is no error then neither the On Success nor On Error stages will not be transitioned to until the CTAXDYNV instruction is disabled.

 

Once the CTAXDYNP has properly enabled the CTRIO2's output then the $CTRIO_000_Out0.OutputEnabled bit will be set ON and the RunVel stage is enabled (not transitioned to).

 

In the RunVel stage should exist the ladder logic (not shown here) that would write various velocity values to the Speed variable as the process requires. When the process is deemed as complete RunVel stage should turn VelocityEnable bit OFF observing the cautions noted in the above Note. Turning VelocityEnable bit OFF causes the following to happen:

  1. The CTRIO2 Pulse Output is disabled ($CTRIO_000_Out0.OutputEnabled = OFF).

  2. The On Success transitions to the Stop stage.

 

The Stop stage merely exits this Program code block.

Example 2 of 2: