Difference between revisions of "Setpoint signal"
From Granite Devices Knowledge Wiki
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| − | + | Setpoint (a.k.a reference) signal is a signal that will be used as ''target value'' in control systems. Typical occurrencies of setpoint signals in GD products are: | |
| − | * Position | + | * Position setpoint |
| − | * Velocity | + | * Velocity setpoint |
| − | * Torque | + | * Torque setpoint |
| − | I.e. position | + | I.e. position setpoint value may be "1234" which could mean a target position of 1234 mm in some linear actuator. Or torque setpoint of 5.0 could mean that motor is asked to produce 5 Nm torque. |
| − | ==Physical | + | ==Physical setpoint signal types== |
| − | + | Setpont signals may have several representations in real world such as: | |
| − | * [[Analog | + | * [[Analog setpoint]] signal |
* [[Pulse and direction]] signals | * [[Pulse and direction]] signals | ||
* [[PWM]] signal | * [[PWM]] signal | ||
* Serial communication command | * Serial communication command | ||
| − | In these cases there will be a conversion between input and output units. For example when using +/-10V | + | In these cases there will be a conversion between input and output units. For example when using +/-10V as velocity setpoint, the relation between input to output types could be 1 Volt per 100 rpm (or any other scale). |
| − | == | + | ==Setpoint signal characteristics== |
{| class="wikitable" | {| class="wikitable" | ||
|- | |- | ||
| − | ! !! [[Analog | + | ! !! [[Analog setpoint|Analog]] !! [[Pulse and direction|Pulse & dir]] or [[Quadrature]] !! [[PWM]] !! Network |
|- | |- | ||
| Scale & range || Absolute (limited) || Incremental (infinite) || Absolute (limited) || | | Scale & range || Absolute (limited) || Incremental (infinite) || Absolute (limited) || | ||
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*Incremental (infinite) | *Incremental (infinite) | ||
|- | |- | ||
| − | | | + | | Setpoint uses in motion control || Torque, velocity || Position, velocity || Torque, velocity || Position, torque, velocity, parameters |
|- | |- | ||
| Pros | | Pros | ||
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*High resolution & accuracy | *High resolution & accuracy | ||
*Reduce wiring | *Reduce wiring | ||
| − | *More functions than just | + | *More functions than just setpoint |
|- | |- | ||
|Cons | |Cons | ||
Revision as of 21:16, 24 June 2013
Setpoint (a.k.a reference) signal is a signal that will be used as target value in control systems. Typical occurrencies of setpoint signals in GD products are:
- Position setpoint
- Velocity setpoint
- Torque setpoint
I.e. position setpoint value may be "1234" which could mean a target position of 1234 mm in some linear actuator. Or torque setpoint of 5.0 could mean that motor is asked to produce 5 Nm torque.
Physical setpoint signal types
Setpont signals may have several representations in real world such as:
- Analog setpoint 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 as velocity setpoint, the relation between input to output types could be 1 Volt per 100 rpm (or any other scale).
Setpoint signal characteristics
| Analog | Pulse & dir or Quadrature | PWM | Network | |
|---|---|---|---|---|
| Scale & range | Absolute (limited) | Incremental (infinite) | Absolute (limited) |
|
| Setpoint uses in motion control | Torque, velocity | Position, velocity | Torque, velocity | Position, torque, velocity, parameters |
| Pros |
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| Cons |
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