Difference between revisions of "Setpoint signal"
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Revision as of 11:16, 18 April 2012
Reference signal is a signal that will be used as target value in control systems. Typical occurrencies of reference signals in GD products are:
- Position reference
- Veloicty reference
- Torque reference
I.e. position reference value may be "1234" which could mean a target position of 1234 mm in some linear actuator. Or torque reference of 5.0 could mean that motor is asked to produce 5 Nm torque.
Physical reference signal types
Reference signals may have several representations in real world such as:
- Analog reference signal
- Pulse and direction signals
- PWM signal
- Serial communication command
In these cases there will be a conversion between input and output units. For example when using +/-10V reference as velocity reference, the relation betveen input to output types could be 1 Volt per 100 rpm (or any other scale).
Reference signal characteristics
| Analog | Pulse & dir or Quadrature | PWM | Serial | |
|---|---|---|---|---|
| Scale & range | Absolute (limited) | Incremental (infinite) | Absolute (limited) |
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| Reference uses in motion control | Torque, velocity | Position, velocity | Torque, velocity | Position, torque, velocity |
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| Cons |
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