An absolute encoder does not replace the limits
A servo can use an incremental or absolute encoder; encoder type and motor wattage are selected independently.
- TypeOn the servo page
- AbsoluteCan skip homing
- LimitsStay in place
- InputNPN 24 V is common
Encoder type and position retention
An incremental encoder usually establishes position through homing after power-up. An absolute encoder can retain the previous position, so some machines can start without another homing cycle.
Encoder type and the 100 W to 1500 W power rating are separate configuration fields, selected from the servo model and operating requirements.
Confirm the limits separately
| Encoder | What it can change | What it does not change |
|---|---|---|
| Incremental | Homing is usually required to establish position | The limit sensors still have to be confirmed |
| Absolute | Many machines do not home on every power-up | The limit sensors still have to be confirmed |
Confirm the sensor level, the mounting direction, and the terminal names on the unit. NPN 24 V is a common input, not a substitute for the silkscreen.
Encoder and limit wiring
- Encoder wiring and the full terminal sheet are supplied for the selected servo model.
- Include the encoder type, axis count, and limit sensor type in the inquiry.
- Positive and negative limits provide travel protection and are configured separately for the machine.
Position and protection
Application: the servo page already says absolute, and the question is whether homing can be reduced.
Configuration: the limit sensors, the level, and the silkscreen terminals. Do not pick a default encoder when the type is unknown.
Related information
Related pages: Integrated servo drive, Limit sensors