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National Instruments ValueMotion 2 Channel LM628 Servo Card - 2007-06-08 -
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This servo card has 2 channels of LM628 servo chip installed.  This is the National Semiconductor Servo control chip. Data Sheet here: LM628 DataSheet    This card comes with a manual showing you how to use it.

The block diagram above shows how an LM628 is used.

National Instruments has software to support this line of hardware

---- product overview ----

The National Instruments ValueMotion line of products provides for two or four axis stepper motor control.  ValueMotion stepper and servo motor expansion boards allow linear 1D, 2D and 3D point-to-point motion, co-ordinated multi axis operation, electronic servo gearing and closed loop stepper motor operation.

• Intelligent 2 or 4 Axis Controll

• Windows NT / 9x Software

• Complete Command Library and DLLs

• Programming possible in LabWindows / CVI, C, C++ and Visual Basic

Stepper Motor Controller Boards:

  • Full, half and microstep operation up to 750 000 steps per second
  • With or without feed-back inputs from incremental encoders
  • Programmable digital inputs and outputs
  • Inputs for limit and home switches
  • Step and direction, or CW / CCW control outputs 

Servo Motor Controller Board:

  • 3 kHz PID regulated frequency
  • Programmable digital inputs and outputs
  • Inputs for limit and home switches
  • Feed-back inputs from incremental encoder
  • Analogue (+10V) or PWM control outputs


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