System Solution – Universal Encoder System (LWL)


System solution

U-ONE Generation II (LWL) – universal encoder system

System solution U-ONE(-SAFETY)-LWL

  • A modular encoder system with electronic function modules in the switchboard
  • Position and speed monitoring, both optionally available with safety certification SIL 2 / PL d
  • Interference-free FOC signal transmission via just one fiber optic cable
  • Resolution: absolute 13 bit singleturn / 15 bit multiturn and incremental up to 4096 ppr

Electronic position switches Absolute encoders Incremental encoders Overspeed switches Analog signal

Universal encoder system – LWL, fiber optics

The innovative U-ONE(-SAFETY)-LWL universal encoder systems for speed and position monitoring improve performance by making optimal use of permitted speed ranges and fast and precise positioning. The LWL (FOC) encoder systems are comprised of a basic unit and function modules in the switchboard. They are ideal for applications in which signal transmission via fiber optic cable is possible and there is sufficient space in the switchboard. The encoder systems transmit signals over long distances of up to 1,000 meters with no interference and cost-effectively using just one fiber optic cable. Their multifunctional design type simplifies installation and connection. The all-in-one encoder systems are directly mounted onto the shaft that needs to be monitored. They therefore require no additional mechanical components such as distribution gears, distribution couplings or speed increasing gears and additionally offer higher accuracy. The simple parameter input and preset function after maintenance work ensure high system availability. The encoder systems are optionally available with all components certified for use in safety applications with requirements up to SIL 2 / PL d.

Technical Data


Supply voltage 15-27 VDC
  • Singleturn up to 13 bit (8192 steps per rotation)
  • Multiturn 15 bit (32768 rotations)
Switching outputs Via input/output modules in the switchboard:

  • Speed switch (NO contact)  |  UO-EGS / UO-SGS
  • Position switch (NO contact) |  UO-ERC / UO-SRC

Details see System solution U-ONE(-SAFETY)-LWL
(Electronic function modules)

Signal outputs/Interfaces Via controller and communication modules in the switchboard:

  • PROFIsafe via PROFINET IO  |  UO-SPN
  • PROFIsafe via PROFIBUS-DP  |  UO-SPB
  • Incremental and current output 4 … 20 mA (without SIL)  |  UO-ECU / UO-SCU (Option -G)

Details see System solution U-ONE(-SAFETY)-LWL
(Electronic function modules)

Maximum rotation 2800 rpm
Electrical connection Details see System solution U-ONE(-SAFETY)-LWL
(basic units and electronic function modules)
Construction type / Ø shafts Details see System solution U-ONE(-SAFETY)-LWL
(basic units)
Device temperature range
  • Basic units: -25 °C to +67 °C
  • Electronic function modules: -25 °C to +60 °C
Degree of protection
  • Basic units: IP66
  • Electronic function modules: IP20 (switchboard installation)
Weight Approx. 3.6 kg (basic unit only) + weight of the individual modules
Device options Details see System solution U-ONE(-SAFETY)-LWL
(basic units and electronic function modules)
Mechanical options Details see System solution U-ONE(-SAFETY)-LWL
(basic units)
Special features and certificates
  • USL(H) 42 and modules UO-SCU, UO-SGS, UO-SRC, UO-SPB/SPN: SIL 2 (DIN EN 61508); PL d (DIN EN ISO 13849), system-wide two channel architecture incl. internal cross-checking.
  • Modular concept for tailor-made solutions
  • Higher availability and maximum safety (SIL 2 / PL d) for for various application-related safety functions (SLS, SLP, ..).
  • No license fees / no need for specialist programmers



U-ONE(-SAFETY) – Generation II (de/en)


Simplifying Cranes (de-en)


Inquiry forms


U-ONE-LWL (en)
Configuration manual


Configuration manual


UOL(H) 40 (en)
Operating and assembly instructions


USL(H) 42 (en)
Operating and assembly instructions


UO-ECU(-G) (en)
Operating and assembly instructions


UO-SCU(-G) (en)
Operating and assembly instructions


UO-EGS-R / UO-ERC-R (en)
Operating and assembly instructions


UO-SGS-R / UO-SRC-R (en)
Operating and assembly instructions


UO-SPN-1 (en)
Operating and assembly instructions


UO-EPB-1 (en)
Operating and assembly instructions


UO-SPB-1 (en)
Operating and assembly instructions


U-ONE(-SAFETY)-LWL / US42Pro (de/en)

Software i




EU declaration of conformity