Can a single-turn encoder measure more than 360 degrees?
Its reported absolute angle repeats after each revolution. A controller can count turns while powered, but that is not the same as a multi-turn encoder that retains revolution information.
Technical selection, cross-reference and global export supportSend a model or application →
Encoder selection guide
Single-turn or multi-turn absolute encoder?
Choose between one-revolution angle feedback and retained position across multiple shaft turns.
DIRECT ANSWER
A single-turn absolute encoder identifies the shaft angle within one revolution. A multi-turn absolute encoder also tracks the number of completed revolutions, allowing a controller to determine position across a longer mechanical range. Choose multi-turn when the measured axis can move through multiple revolutions and must retain that position after power loss.
✓ Single-turn measures position within 360°✓ Multi-turn adds completed-turn information✓ Turn range must cover the full mechanical travel✓ Retention method must be confirmed by encoder design
SELECTION TABLE
Single-turn and multi-turn comparison
Use this table as an initial engineering checklist. Final model configuration must be confirmed against the controller, mechanical drawing and operating environment.
Single-turnMulti-turn
Angle repeats after each revolutionReports angle plus revolution count
Suitable for one-revolution mechanismsSuitable for winches, screws, long axes and geared motion
Specified mainly by bits per revolutionSpecified by single-turn bits plus turn range or multi-turn bits
Simpler selectionRequires checking turn overflow and retention technology
ENGINEERING PROCESS
How to select the right configuration
- 01
Calculate the maximum number of encoder shaft turns across full machine travel.
- 02
Include gearing, safety margin and possible overtravel.
- 03
Define required angle resolution within each turn.
- 04
Confirm how multi-turn position is retained and how overflow is handled.
RELEVANT PRODUCTS
Technical product pages
Mechanical Multi-turn IP54 Absolute Encoder
Battery-free IP54 geared turn counting retains absolute position through power loss.
View parameters and drawings →RS485 Modbus RTU Absolute Rotary Encoder
Single-turn or battery-free mechanical multi-turn absolute position feedback with power-off memory and programmable Modbus RTU parameters.
View parameters and drawings →COMMON QUESTIONS
Frequently asked questions
How many turns should a multi-turn encoder support?
The range must exceed the maximum encoder shaft revolutions across the machine travel, including gearing, setup movement and a suitable overtravel margin.
Are all multi-turn encoders battery powered?
No. Multi-turn technologies include mechanical geared counting and other designs. Confirm the retention principle and maintenance requirements for the selected model.
RELATED GUIDANCE
Continue your selection
EDITORIAL SCOPE
How this guidance is prepared
FOSAI consolidates available supplier technical material into a buyer-oriented selection guide. Parameters, certifications and compatibility are not generalized across every model; the final suffix, controlled drawing and project conditions must be confirmed before ordering.
MODEL SELECTION SUPPORT
Send the model.
We’ll check the complete fit.
Include the existing model, controller interface, supply, measurement range, shaft or mounting drawing, environment and quantity.
Request technical selection →