Editing Setpoint signal

Reference signal is a signal that will be used as ''target value'' in control systems. Typical occurrences 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 Nm would mean that motor is asked to produce 5 Nm torque.
==Physical reference signal types==
In practice, reference signals may have several representations in real world including:
* Analog voltage 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 types could be 1 Volt per 100 rpm (or any other scale).
@@ Line 1: / Line 1: @@
-[[File:Setpoint and actual.png|thumb|400px|An example setpoint signal (target value) and measured response signal (realized output value) of a control system.]]
+Reference signal is a signal that will be used as ''target value'' in control systems. Typical occurrences 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:
+* Position reference
-* Position setpoint
+* Veloicty reference
-* Velocity setpoint
+* Torque reference
-* Torque setpoint
+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 Nm would 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.
+==Physical reference signal types==
-==Physical setpoint signal types==
+In practice, reference signals may have several representations in real world including:
-Setpont signals may have several representations in real world such as:
+* Analog voltage signal
-* [[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).
+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 types could be 1 Volt per 100 rpm (or any other scale).
-==Setpoint signal characteristics==
-{| class="wikitable"
-|-
-!   !! [[Analog setpoint|Analog]] !! [[Pulse and direction|Pulse & dir]] or [[Quadrature]] !! [[PWM]] !! Serial / Network
-|-
-| Scale & range || Absolute (limited) || Incremental (infinite) || Absolute (limited) ||
-*Absolute (near infinite)
-*Incremental (infinite)
-|-
-| Setpoint uses in motion control || Torque, velocity || Position, velocity || Torque, velocity || Position, torque, velocity, parameters
-|-
-| Pros
-||
-* Widely used
-* Easy to measure
-||
-*Widely used
-*Exact
-*Noise robust
-||
-*EMI noise robust
-*Precise
- ||
-*High resolution & accuracy
-*Reduce wiring
-*More functions than just setpoint
-|-
-|Cons
- ||
-*EMI noise sensitive
-*Offset & gain errors
- ||
-*Limited resolution at low frequency
-*Need reference zeroing because incremental
-||
-*Various "standards", sometimes incompatible
-||
-*Many standards
-*Usually incompatible with other standards
-|}
-[[Category:Signals]]
-[[Category:Glossary]]