Optical incremental encoder
Pepperl+Fuchs ENI58IL optical incremental encoder
General-purpose 58 mm incremental encoder with 25 to 5,000 pulses per revolution, push-pull or RS-422 output up to 400 kHz, 4.75–30 V DC supply and up to 12,000 rpm (IP65).
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Select everything you need. A motor, drive and gearbox can be specified together as one axis.
Key specifications
| Speed (max) | 12,000 rpm |
|---|---|
| Ingress protection | IP65 or IP67 (6,000 rpm at IP67) |
| Temperature | -40–85 °C |
| Supply | 4.75–30 V DC |
| Ppr | 25–5,000 |
| Outputs | universal push-pull (level follows supply) or RS-422 |
| Output frequency max | 400 |
| Housing | 58 |
| Shaft | 6, 8, 10 or 12 mm solid stainless steel shaft; hollow and recessed hollow versions |
Summarised in our own words from Pepperl+Fuchs SE (family-owned)'s published data; series maxima, individual models vary. Last checked 2026-10-30. Source 1
Notes on this data
Sensing principle not stated on the datasheet read; classed optical-incremental (assumption, check before publishing as fact). Figures from the solid-shaft ENI58IL-S datasheet.
Specify Motion is not affiliated with Pepperl+Fuchs SE (family-owned). Pepperl+Fuchs and ENI58IL are used only to identify the product. Comparisons use published figures; always confirm against the current datasheet.
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Our experienced engineers are on hand, ready to help with your project. Whether you need the Pepperl+Fuchs ENI58IL itself, help sourcing it, or a modified or custom design built around your load, speed and space, tell us what the machine has to do and we'll come back with the right option.
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Typical applications
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 Pepperl+Fuchs ENI58IL
Send these with your enquiry and an engineer can confirm the right ENI58IL 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
Pepperl+Fuchs ENI58IL: frequently asked questions
Can you help replace Pepperl+Fuchs ENI58IL or source the original?
Send the full model code, quantity and required date. Our engineers can check original-part availability and assess suitable alternatives, including supply-network options where appropriate. We confirm compatibility and any changes needed before recommending a replacement.
What is the Pepperl+Fuchs ENI58IL?
General-purpose 58 mm incremental encoder with 25 to 5,000 pulses per revolution, push-pull or RS-422 output up to 400 kHz, 4.75–30 V DC supply and up to 12,000 rpm (IP65). Published series figures include speed 12,000 rpm, temperature -40 °C, temperature 85 °C. It is made by Pepperl+Fuchs SE (family-owned); Specify Motion can help source it or propose an equivalent.
Who makes the Pepperl+Fuchs ENI58IL?
The Pepperl+Fuchs ENI58IL is made by Pepperl+Fuchs (Pepperl+Fuchs SE (family-owned)) and is listed here for engineers comparing options. Specify Motion is not affiliated with Pepperl+Fuchs SE (family-owned); brand names are used only to identify the product.
What is the speed of the Pepperl+Fuchs ENI58IL?
The published series maximum speed is 12,000 rpm. Individual models and sizes in the ENI58IL 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 Pepperl+Fuchs ENI58IL?
We can assess suitable replacement options. Our engineers can review the original model and propose options for 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
Engineer support
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Tell us about your project and how you use the Pepperl+Fuchs ENI58IL: the load, speed, duty and environment. An experienced engineer will review it and reply, normally within one working day.
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