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U-ONE® system: EGS module SIL 2 certified

The universal encoder system U-ONE from Johannes Huebner Giessen offers ten function modules in a single unit. The EGS module UO-EM-EGS 41 is an electronic overspeed switch designed to detect over- and underspeeds. The module is certified to EN 61508 SIL CL2 and EN 13849 PL d. Module functionality includes switch delay, inverse direction of rotation evaluation, switching function dependent on the direction of rotation and an option to perform switch tests. In addition, the UO-EM-EGS 41 offers functions such as slip detection, open-circuit recognition and delayed overcurrent switch off. The module is programmed via the decoder interface.

Other function modules belonging to the U-ONE system offer the following functions: Speed monitoring, position detection, a large variety of bus interfaces, diverse Ethernet connections, electronic cam controller, synchronization module and graphic display of sequential processes.


Supply voltage

12 - 30 VDC

Connection technology

Internal bus connection

Switching outputs S1 and S2

Positively driven relay contacts, max. 230 V AC/DC, 5 - 500 mA

Switching output diagnostics

Relay contact, max. 230 V AC/DC, 5 - 500 mA

Switching capacity

max. 230 V AC/DC, 500 mA

Reset input

floating, reset voltage 12 - 30 VDC, approx. 7 mA

Switching speed range

0.5 to 2700 rpm

Setting range

Programmable across the whole switching speed range

Programmable functions

Password protection

Inverse rotation evaluation

Overspeed and underspeed

Switching function according to direction of rotation

Switch delay

Slip detection

Broken wire detection

Delayed overcurrent switch-off

Switch test


Programming interface

Mini USB

Device temperature range

-25 °C to +70 °C

Operating and Assembly Instructions (PDF, 1.5 MB) Download
Configuration Instructions (PDF, 1.35 MB) Download
Catalog - U-ONE (PDF, 2.99 MB) Download
Software EGS41 Pro (ZIP, 37.5 MB) Download

Version: 1.60 R1

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

Case Study - Blast furnace skip hoist, rolling mill (PDF, 1.21 MB) Download
Case Study - Hoist/drum, rolling mill (PDF, 163 KB) 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.