UOL(H) 40 / USL(H) 42 SIL 2 U-ONE Basic Unit


UOL(H) 40 / USL(H) 42 SIL 2

U-ONE Generation II (LWL) – basic unit

System solution U-ONE(-SAFETY)-LWL

  • High accuracy thanks to direct gearless mounting to the application shaft plus high resolution (13 bit singleturn / 15 bit multiturn)
  • Interference-free signal transmission to the function modules in the switchboard via just one fiber optic cable (up to 1000 m)
  • High reliability even when exposed to extreme operating conditions
  • Options: Without SIL/PL certification (UOL(H) 40); through hollow shaft, solid shaft for flange or foot mounting, INOX (housing made of V4A / AISI 316), Ex (ATEX / IECEx certification zones 2 and 22)

U-ONE Generation II (LWL) – basic unit

The basic units of the new second-generation universal encoder systems determine and monitor speed and position. They measure the speed and angular position of the application shaft, convert electrical signals into optical signals and transmit them to the (safety) control unit with no interference via fiber optic cable. The compact basic units with an integrated LWL (FOC) transmitter are ideal for mounting onto the shaft because the electronic function modules are stored separately in the switchboard. The units are suitable for use both in new plants and as a modernization solution. Direct mounting requires no additional mechanical components such as distribution gears, distribution couplings or speed increasing gears. The systems are optionally available as certified up to SIL 2 / PL d.

Technical Data


Supply voltage 15-27 VDC
  • Singleturn13 bit (8192 steps per rotation)
  • Multiturn 15 bit (32768 rotations)
Switching outputs Via input/output modules in the switchboard
Signal outputs/Interfaces Via controller and communication modules in the switchboard
Maximum rotation 2800 rpm
Electrical connection Terminal box:

  • 1 x ST connectors FOC (50/125 µm or 62.5/125 µm)
  • 2 Screw terminals (supply voltage)
Construction type / Ø shafts
  • Solid shaft (B5, B35) / Ø 11 mm, Ø 14 mm with feather key
  • Hollow shaft / Ø 20 mm with keyway
Device temperature range -25 °C to +67 °C
Degree of protection IP66
Weight Approx. 3.6 kg
Device options Via electronic function modules in the switchboard
Mechanical options
  • Solid shaft devices: Additional foot (Bauform B35)
  • Hollow shaft devices: Through adapter shaft (for add-on units), torque brackets (on request)
  • Stainless steel housings (V4A / AISI 316)
  • Cable protection systems (for UOL 40)
  • Safety-integrated solid shaft mounting / hollow shaft mounting with suitably designed safety components incl. Declaration of Conformity
Special features and certificates USL(H) 42: SIL 2 (DIN EN 61508); PL d (DIN EN ISO 13849)

ATEX / IECEx (zones 2 and 22)



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


Inquiry forms


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


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


EU declaration of conformity