UOM 41L basic unit SIL 2

U-ONE® system: Basic unit SIL 2 certified

Speed, position and overspeed detection in one – U-ONE the universal encoder system from Johannes Huebner Giessen offers up to ten functions in a single unit. The system includes a universal basic unit that is connected to the electronic function modules on the switchboard via EMC proof fiber optic cable. The basic unit UOM 41L-1212 in a rugged aluminium casing is certified to EN 61508 SIL CL2 and EN 13849 PL d. It is designed for maximum speeds up to 3000 rpm; it is available as construction types B5 with flange and B35 with flange and foot. It is possible to arrange the ten function modules belonging to the system side-by-side in any order to facilitate flexible configuration.


Diameter solid shaft

11 mm or 14 mm

Supply voltage

12 - 30 VDC

Pulse rates


Resolution singleturn

12 bit (4096 pulses per revolution)

Resolution multiturn

12 bit (4096 revolutions)

Signal transmission

optical via FOC

Device temperature range

-25 °C to +85 °C

Degree of protection

IP65 / IP66


approx. 2.5 kg

Special features

Certified to EN 61508 SIL CL2 and EN 13849 PL d

Diameter hollow shaft 20 mm available

Operating and Assembly Instructions (PDF, 4.24 MB) Download
Software U-ONE basic unit (ZIP, 10.16 MB) Download

Version: 2 Rev 5.0

Microsoft Windows® XP, Vista, 7, 8, 8.1, 10

Software UO-AWG-PRO (ZIP, 1.62 MB) Download

Version: 1 Rev 1.0

Microsoft Windows® 98, NT, 2000, XP, Vista, 7, 8, 8.1, 10

Software ERC Pro (ZIP, 1.79 MB) Download

Version: 3 Rev 9.5

Microsoft Windows® 98, NT, 2000, XP, Vista, 7, 8, 8.1, 10

Software CanOpen driver (ZIP, 2 KB) Download
Software PROFIBUS driver (ZIP, 9 KB) Download
Catalog - U-ONE (PDF, 2.99 MB) Download


Standard dimension drawings and connection diagrams are provided in the Operating and Installation Instructions. We would be pleased to send you individual variations as well as DXF/STEP files on request.