Difference between revisions of "SimpleMotion motion control strategies"

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! Strategy !! Implementation !! Features !! Cons !! Need real-time host !! Synchronized multi-axis motion
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! Strategy !! Implementation !! Features !! Cons !! Need real-time host !! Synchronized multi-axis motion !! Example implementation
 
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| Parameter communication ||  
 
| Parameter communication ||  
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*No multi-axis synchronization, all axes operate in point-to-point mode individually
 
*No multi-axis synchronization, all axes operate in point-to-point mode individually
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|| No || No || [https://github.com/GraniteDevices/SimpleMotionV2Examples PointToPointExample]
 
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| Buffered motion commands ||  
 
| Buffered motion commands ||  
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*Use of {{param|CIS}} smoothens any motion above 250 Hz to silky smooth
 
*Use of {{param|CIS}} smoothens any motion above 250 Hz to silky smooth
 
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*Delay caused by buffering (0.1-1.0 sec buffering is recommended to avoid buffer underruns and stopping of motion)
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*Delay caused by buffering (0.2-1.0 sec buffering is recommended to avoid buffer underruns and stopping of motion)
 
*Update rate will reduce as more axes are added to the system (due to bus bandwidth limit)
 
*Update rate will reduce as more axes are added to the system (due to bus bandwidth limit)
 
*Some added complexity in programming
 
*Some added complexity in programming
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|| No || Yes
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|| No || Yes|| [https://github.com/GraniteDevices/SimpleMotionV2Examples BufferedMotionStreamExample]
 
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| Real-time motion commands ||  
 
| Real-time motion commands ||  
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*For smooth unterrupted motion, need hard real-time host, such as RTLinux, [[PLC]] or microcontroller platform.  
 
*For smooth unterrupted motion, need hard real-time host, such as RTLinux, [[PLC]] or microcontroller platform.  
 
*[[SimpleMotion V2 USB adapter]] may add uncertainty to timing, so use of other adapter may be necessary (PCI, PCI-E, PLC port or other peripheral, such as microcontroller USART).
 
*[[SimpleMotion V2 USB adapter]] may add uncertainty to timing, so use of other adapter may be necessary (PCI, PCI-E, PLC port or other peripheral, such as microcontroller USART).
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|| Yes || Yes
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|| Yes || Yes || Coming to GitHub
 
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Revision as of 12:03, 11 February 2016

SimpleMotion V2 allows building single and multi-axis motion control applications in three different strategies. The table below summarizes the options.

Strategy Implementation Features Cons Need real-time host Synchronized multi-axis motion Example implementation
Parameter communication

Send setpoint commands to a target drive with simple "write parameter" commands

  • The easiest way to do point-to-point motion control
  • Motion acceleration and velocity trajectories are produced by drive and can be set before motion is started
  • Can modify any drive parameter on the fly
  • Can be used together with other setpoint sources
  • No multi-axis synchronization, all axes operate in point-to-point mode individually
 No No PointToPointExample
Buffered motion commands

List of positions are uploaded to drive command buffers and executed by drives based on clock

  • Allow synchronizing multiple axes and running arbitrary motion paths
  • Motion acceleration and velocity profiles are generated by user application
  • Drives syncronize clocks so motion stays in sync infinitely
  • Typical setpoint update rates are 250 Hz to 1000 Hz for 1 to 4 axis systems
  • Use of Setpoint smoothingCIS smoothens any motion above 250 Hz to silky smooth
  • Delay caused by buffering (0.2-1.0 sec buffering is recommended to avoid buffer underruns and stopping of motion)
  • Update rate will reduce as more axes are added to the system (due to bus bandwidth limit)
  • Some added complexity in programming
 No Yes BufferedMotionStreamExample
Real-time motion commands

Position commands are sent to drives just like in parameter communication strategy, except in high update rate and from real-time host

  • Allow synchronizing multiple axes and running arbitrary motion paths
  • Motion acceleration and velocity profiles are generated by user application
  • Use of Setpoint smoothingCIS smoothens any motion above 250 Hz to silky smooth
  • There is virtually no delay between command and action
  • Higher scalability, can use multiple SimpleMotion buses to support large number of axis
  • Update rate will reduce as more axes are added to the system (due to bus bandwidth limit), however, see the scalability feature in Features column
  • For smooth unterrupted motion, need hard real-time host, such as RTLinux, PLC or microcontroller platform.
  • SimpleMotion V2 USB adapter may add uncertainty to timing, so use of other adapter may be necessary (PCI, PCI-E, PLC port or other peripheral, such as microcontroller USART).
 Yes Yes Coming to GitHub
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