Optical incremental encoder
SICK DFS60 optical incremental encoder
60 mm programmable incremental encoder with up to 65,536 pulses per revolution, switchable TTL/HTL output and programmable zero-pulse width; the blind-hollow-shaft version is rated IP67 housing, 6,000 rpm and up to +100 °C.
Key specifications
| Speed (max) | 6,000 rpm |
|---|---|
| Bore (max) | 10 mm |
| Ingress protection | IP67 housing side / IP65 shaft side |
| Temperature | -40–100 °C |
| Supply | 4.5–32 V |
| Ppr max | 65,536 |
| Outputs | TTL or HTL, 6-channel (programmable) |
| Programmable | output level, pulse count, zero-pulse width |
Summarised in our own words from SICK AG's published data; series maxima, individual models vary. Last checked 2026-10-30. Source 1
Notes on this data
Sensing principle still unverified (2026-10-30): SICK data sheets and operating instructions read do not name it, and a trade article only says the AFS/AFM60 and DFS60 family is 'based on optical and magnetic technologies'. Type kept as optical pending confirmation from SICK.
Specify Motion is not affiliated with SICK AG. SICK and DFS60 are used only to identify the product. Comparisons use published figures; always confirm against the current datasheet.
Typical applications
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What an optical incremental encoder is
An optical incremental encoder measures motion by shining light through or reflecting it from a disc or scale with fine graduations onto photodetectors. As the disc or scale moves, the encoder outputs two square-wave or sine-wave channels in quadrature, called A and B, plus an index pulse once per revolution or at reference marks. The counter in the drive or controller tracks position by counting edges from a home point. Optical encoders achieve very high resolution and accuracy.
When engineers choose an optical incremental encoder
Choose an optical incremental encoder for precise speed and position feedback where homing at power-up is acceptable, such as servo motors, stages and machine tools. They are widely compatible and cost effective. The trade-offs are contamination and power loss: dust, oil and condensation can obscure the optical path, and position is lost when power is removed. For harsh environments, magnetic or inductive encoders may suit better.
How to specify the SICK DFS60
Send these with your enquiry and an engineer can confirm the right DFS60 variant or an equivalent:
- Resolution (lines per revolution or µm)
- Output type: TTL, HTL or sin/cos
- Index or reference marks
- Shaft or hollow shaft size (mm)
- Maximum speed (rpm or m/s)
- Supply voltage (V)
- Environment and IP code
Common mistakes to avoid
- Choosing resolution above what the drive input can count
- Running long cables with TTL signals without line drivers
- Ignoring contamination in open optical designs
- Forgetting homing routines after power-up
SICK DFS60: frequently asked questions
What is the SICK DFS60?
60 mm programmable incremental encoder with up to 65,536 pulses per revolution, switchable TTL/HTL output and programmable zero-pulse width; the blind-hollow-shaft version is rated IP67 housing, 6,000 rpm and up to +100 °C. Published series figures include speed 6,000 rpm, bore 10 mm, temperature -40 °C, temperature 100 °C. It is made by SICK AG; Specify Motion can help source it or propose an equivalent.
Who makes the SICK DFS60?
The SICK DFS60 is made by SICK (SICK AG) and is listed here for engineers comparing options. Specify Motion is not affiliated with SICK AG; brand names are used only to identify the product.
What is the speed of the SICK DFS60?
The published series maximum speed is 6,000 rpm. Individual models and sizes in the DFS60 range vary, so check the exact variant against your duty cycle, mounting and environment, or ask our engineers to confirm the right size for you.
Is there an alternative to the SICK DFS60?
Yes. Our engineers can propose an equivalent built around your load, speed and environment. An engineer confirms the fit against your application before recommending anything.
What is quadrature output on an incremental encoder?
Quadrature output provides two channels, A and B, offset by 90 electrical degrees. Comparing which leads gives direction, and counting edges on both gives four times the line count in resolution. An index pulse marks a reference position for homing.
What is the difference between TTL and HTL outputs?
TTL outputs use a 5 V differential signal, which suits high frequencies and is commonly used with line drivers. HTL outputs use a higher voltage swing, typically matched to a 10 to 30 V supply, which improves noise immunity on long cables. Match the output type to the drive or controller input.
Further reading: Absolute vs incremental encoders · How to select an encoder · Encoders and feedback
Other optical incremental encoder series
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Tell us about your project and how you use the SICK DFS60: the load, speed, duty and environment. An experienced engineer will review it and reply, normally within one working day.
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