An absolute rotary encoder is a position-feedback device that provides a digital or coded representation of shaft position. Unlike a conventional incremental encoder, an absolute encoder is designed to identify a specific shaft position rather than relying only on accumulated pulses from movement.
Absolute rotary encoders can be used in automation equipment, robotics, machine tools, servo systems, material-handling equipment, and other applications where position feedback is required.
When selecting an absolute rotary encoder, engineers should consider resolution, single-turn or multi-turn operation, communication interface, supply voltage, maximum speed, mechanical dimensions, environmental conditions, and controller compatibility.
For industrial rotary encoder products, you can visit the Sensyor rotary encoder product page.
An absolute rotary encoder is a rotary position sensor that assigns a specific output value or digital code to shaft position.
The control system reads the encoder’s output and determines the corresponding angular position.
This differs from an incremental rotary encoder, which generally produces pulses as the shaft moves. With an incremental encoder, the control system typically tracks movement by counting or interpreting those pulses.
An absolute encoder instead provides position information associated with the shaft’s current position.
Depending on the design, an absolute rotary encoder can be available as:
The exact output technology depends on the encoder design.
An absolute rotary encoder uses a sensing mechanism to identify the angular position of its rotating shaft.
The encoder converts the shaft’s mechanical position into an electrical output that the controller can interpret.
Different absolute encoder technologies use different sensing and coding methods.
The general process can be summarized as:
Mechanical rotation → position detection → encoded output → controller
The controller then uses this information as part of the machine’s feedback system.
The main characteristic of an absolute rotary encoder is that each measurable shaft position is associated with a defined output value.
This can be valuable in applications where the controller needs position information rather than simply knowing that the shaft has moved.
The actual resolution determines how finely the encoder can distinguish angular positions.
Absolute encoders can generally be divided into single-turn and multi-turn configurations.
A single-turn absolute encoder measures position within one revolution.
Once the shaft completes a revolution, the position value returns to the corresponding position in the next revolution.
Single-turn designs can be suitable for applications where only angular position within one revolution is required.
A multi-turn absolute encoder can provide information about both angular position and the number of revolutions, depending on its design.
This makes multi-turn encoders useful for applications involving extended rotational travel.
The specific operating principle and revolution-counting method vary between encoder technologies.
Resolution is a critical specification when selecting an absolute rotary encoder.
For absolute encoders, resolution may be expressed in bits rather than pulses per revolution.
For example, an encoder with an N-bit position value can theoretically represent:
2ᴺ positions per revolution
A 12-bit single-turn encoder therefore represents:
2¹² = 4,096 position values
A 16-bit encoder represents:
2¹⁶ = 65,536 position values
These values describe the theoretical number of distinguishable digital position states according to the specified resolution.
However, resolution is not the same as overall system accuracy.
Real-world position performance can also depend on factors such as:
Therefore, buyers should evaluate both resolution and the manufacturer’s stated performance specifications.
Understanding the difference between an absolute rotary encoder and an incremental encoder can simplify product selection.
| Feature | Absolute Rotary Encoder | Incremental Rotary Encoder |
|---|---|---|
| Position information | Absolute position value | Relative movement information |
| Typical output | Digital code/interface | Pulses/signals |
| Position tracking | Based on encoded position | Based on signal interpretation/counting |
| Single-turn option | Yes | Common |
| Multi-turn option | Available depending on design | Depends on system/configuration |
| Typical consideration | Absolute position feedback | Speed, direction, relative position |
| Interface | Depends on encoder | Depends on encoder |
Neither type is universally better.
The correct choice depends on the machine’s control architecture and feedback requirements.
For applications that need absolute position information, an absolute rotary encoder may be appropriate.
For applications that primarily need pulse-based speed, direction, or relative position feedback, an incremental encoder may be more suitable.
An absolute rotary encoder can be considered for many industrial applications.
Automation systems may require position feedback for motors, actuators, rotating mechanisms, and positioning equipment.
An absolute encoder can provide position information to the control system when the interface and specifications are compatible.
You can explore Sensyor’s rotary encoder products for industrial encoder applications.
Robotic joints can require accurate rotational position feedback.
An absolute encoder may be considered when the robot controller needs shaft-position information.
Mechanical size, resolution, communication interface, and environmental requirements should be evaluated carefully.
Machine tools can use rotary position feedback in different parts of the machine depending on the machine architecture.
An absolute rotary encoder can be considered when the CNC control system requires absolute position feedback.
Servo systems use feedback to monitor motor behavior.
An absolute encoder can provide position information to a compatible servo drive.
The encoder interface, resolution, operating speed, and motor mounting configuration should all be checked.
Packaging equipment can contain rotating shafts, rollers, feeders, and positioning mechanisms.
Absolute position feedback may be useful where the control architecture requires a defined shaft position.
Automated material-handling equipment can use position feedback for rotating components and positioning mechanisms.
The encoder’s environmental protection should be matched to the actual operating conditions.
Textile machinery can contain multiple rotating shafts and motion-control systems.
An absolute rotary encoder may be considered when the control system requires absolute rotational position information.
First determine the required angular resolution.
Consider:
Do not assume that the highest resolution is always necessary.
Determine whether the application needs position within one revolution or position information across multiple revolutions.
Choose a single-turn absolute rotary encoder when one-revolution position information is sufficient.
Consider a multi-turn encoder when the application needs to distinguish positions across multiple revolutions.
The encoder must communicate correctly with the receiving control system.
Depending on the encoder, interfaces may include different serial or digital communication technologies.
Before ordering, confirm:
For industrial electrical and electronic standards information, buyers can refer to the International Electrotechnical Commission (IEC).
The encoder’s permitted operating speed should be appropriate for the machine.
Check the manufacturer’s specified maximum rotational speed and compare it with the actual application.
The required speed should be considered together with resolution and signal-processing requirements.
An absolute rotary encoder must physically fit the machine.
Check:
Always use the manufacturer’s mechanical drawing when checking dimensions.
Evaluate the actual operating environment.
Relevant conditions may include:
Select an encoder whose specified environmental characteristics match the machine’s operating conditions.
Confirm the encoder’s required supply voltage.
The encoder’s electrical requirements should be compatible with the machine’s available power and controller interface.
Incorrect power supply selection can cause improper operation or equipment damage.
Shaft compatibility is particularly important.
Check whether the encoder uses:
Also check the required coupling and mounting structure.
The final selection must be compatible with the receiving control system.
Check the encoder against:
An encoder with excellent specifications may still be unsuitable if its interface cannot communicate with the machine controller.
Correct installation helps ensure that the encoder provides reliable feedback.
Confirm all mounting and shaft dimensions before installation.
Ensure that the encoder and machine shaft are installed according to the manufacturer’s mechanical requirements.
Avoid excessive radial or axial loads.
Use appropriate mounting hardware and follow the manufacturer’s installation instructions.
Follow the correct wiring diagram and pin assignment.
Never assume that connector pinouts are identical between different encoder manufacturers.
Set the appropriate encoder parameters in the PLC, servo drive, CNC system, or motion controller.
Rotate the shaft and verify that the controller receives the expected position information.
After basic commissioning, test the encoder at the expected operating speed and environmental conditions.
Even a correctly specified absolute rotary encoder can experience problems if installation or integration is incorrect.
Check:
Possible areas to investigate include:
Investigate:
The exact cause should be determined using the encoder’s technical documentation and the machine’s control architecture.
When choosing an absolute rotary encoder supplier, evaluate both technical and commercial capabilities.
Important factors include:
For OEM projects, suppliers should also be able to discuss mechanical drawings, electrical interfaces, application requirements, and customization feasibility.
Selecting an absolute rotary encoder should begin with the actual machine requirements.
Sensyor provides rotary encoder products for industrial applications.
You can visit the Sensyor rotary encoder product page to explore the available encoder range.
When requesting product information, provide:
For OEM applications, a mechanical drawing and controller information can also be useful when evaluating compatibility.
An absolute rotary encoder is a position-feedback device that provides a defined output value corresponding to the shaft’s angular position.
An absolute encoder detects the shaft’s angular position and converts that position into an encoded electrical output that a compatible controller can interpret.
An absolute encoder provides position information associated with the shaft’s position, while an incremental encoder generally produces pulses representing relative movement.
A single-turn absolute encoder measures the shaft position within one revolution. Its position value corresponds to an angular position within that revolution.
A multi-turn absolute encoder can provide information about shaft position across multiple revolutions, depending on its design and revolution-counting technology.
No. Higher resolution can provide more distinguishable position values, but the appropriate resolution depends on the machine, controller, mechanical system, and actual positioning requirements.
Yes, provided that the encoder’s communication or output interface is compatible with the PLC or an appropriate interface module.
Yes. An absolute encoder can be used in servo applications when its mechanical configuration, feedback interface, resolution, speed rating, and other specifications are compatible with the servo system.
Provide the application, encoder type, resolution, single-turn or multi-turn requirement, communication interface, supply voltage, maximum speed, shaft dimensions, mounting requirements, environmental conditions, and controller information.
You can visit the Sensyor rotary encoder product page to explore available rotary encoder products.
An absolute rotary encoder provides position feedback by associating the encoder shaft’s angular position with a defined output value.
Compared with incremental encoders, absolute encoders can be useful when a control system requires absolute position information. Depending on the application, buyers can choose between single-turn and multi-turn configurations and different communication interfaces.
However, encoder selection should not be based on resolution alone.
Engineers should evaluate resolution, operating speed, communication interface, power supply, shaft dimensions, mounting, environmental conditions, and controller compatibility.
For OEMs and machine builders, technical documentation, sample testing, customization capability, production capacity, and supplier support can also be important.
If you are sourcing an absolute rotary encoder for industrial automation, robotics, servo systems, CNC equipment, packaging machinery, textile machinery, or other industrial applications, define the complete machine requirements before selecting a product.
You can visit the Sensyor rotary encoder product range to explore industrial rotary encoder solutions.
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