Editing Setpoint signal

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[[File:Setpoint and actual.png|thumb|400px|An example setpoint signal (target value) and measured response signal (realized output value) of a control system.]]
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Reference signal is a signal that will be used as ''target value'' in control systems. Typical occurrencies of reference signals in GD products are:
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:
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* Position reference
* Position setpoint
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* Velocity reference
* Velocity setpoint
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* Torque reference
* Torque setpoint
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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.
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.
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==Physical reference signal types==
==Physical setpoint signal types==
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Reference signals may have several representations in real world such as:
Setpont signals may have several representations in real world such as:
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* [[Analog reference]] signal
* [[Analog setpoint]] signal
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* [[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 as velocity setpoint, the relation between input to output types could be 1 Volt per 100 rpm (or any other scale).
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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).
==Setpoint signal characteristics==
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==Reference signal characteristics==
 
{| class="wikitable"
 
{| class="wikitable"
 
|-
 
|-
!  !! [[Analog setpoint|Analog]] !! [[Pulse and direction|Pulse & dir]] or [[Quadrature]] !! [[PWM]] !! Serial / Network
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!  !! [[Analog reference|Analog]] !! [[Pulse and direction|Pulse & dir]] or [[Quadrature]] !! [[PWM]] !! Network
 
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|-
 
| Scale & range || Absolute (limited) || Incremental (infinite) || Absolute (limited) ||  
 
| Scale & range || Absolute (limited) || Incremental (infinite) || Absolute (limited) ||  
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*Incremental (infinite)
 
*Incremental (infinite)
 
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| Setpoint uses in motion control || Torque, velocity || Position, velocity || Torque, velocity || Position, torque, velocity, parameters
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| Reference uses in motion control || Torque, velocity || Position, velocity || Torque, velocity || Position, torque, velocity, parameters
 
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|-
 
| Pros  
 
| Pros  
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*High resolution & accuracy
 
*High resolution & accuracy
 
*Reduce wiring
 
*Reduce wiring
*More functions than just setpoint
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*More functions than just reference
 
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|-  
 
|Cons
 
|Cons
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*Usually incompatible with other standards
 
*Usually incompatible with other standards
 
|}
 
|}
[[Category:Signals]]
 
[[Category:Glossary]]
 

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