UOC 40 / USC 42 SIL 2 (U-ONE-Compact)

Universal encoder systems

  • Ø 14 mm solid shaft (flange or foot mounting)
  • Heavy-duty housing with directly attached function modules
  • High signal quality for more reliable detection of speed and position
  • Options: Variety of output signals, SIL 2 / PL d certification (USC 42)
Electronic position switchesAbsolute encodersIncremental encodersOverspeed switchesAnalog signal
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The compact all-in-one systems

The compact universal encoder systems U-ONE-(SAFETY-) Compact combine a variety of functions in a rugged housing. They sense and monitor speeds and positions. Consequently, they are ideally suitable for easy upgrades to legacy solutions when the existing cabling is to remain in use or if there is no space available in the switchboard for electronic function modules. The multifunctional construction simplifies their installation and connection. Thanks to direct attachment to the shaft to be monitored the all-in-one systems do not required any additional mechanical components such as transfer gearboxes, transfer couplings or speed step-up gearing; and on top of that they offer greater accuracy. They are optionally certified for safety applications up to SIL 2 / PL d.

Technical Data

Supply voltage

15-27 VDC

  • Multiturn 15 bit (32768 rotations)
  • Singleturn 13 bit (8192 steps per rotation)
Switching outputs

Speed and position switch modules (NO contact 5…230 V / 0.5 A AC/DC):

  • Speed switch (0.5-2520 rpm) 
  • Position switch (max. 32768 rotations)
  • Failure switch

Further switching functions on request

Signal outputs/Interfaces

Basic unit (SCU):

  • Current output 4-20 mA (without SIL)
  • Incremental output 1024 / 4096 pulses configurable (without SIL)
  • Status output and error output

Absolute value interface (bus module) UOC 40:

  • PROFIBUS-DP (without SIL): Resolution: 12 bit singleturn / 12 bit multiturn

Absolute value interface (bus module) USC 42:

  • PROFIsafe via PROFIBUS-DP (SIL 2 / PL d): Resolution: 13 bit singleturn / 15 bit multiturn
    (PROFIBUS-DP: RS485, baud rate 9.6 kbit/s...12 Mbit/s, device address 1-99 possible)
  • PROFIsafe via PROFINET IO (SIL 2 / PL d)
    (PROFINET IO: Transmission rate 100 Mbit/s)
Maximum rotation

Solid shaft: up to 2800 rpm

Electrical connection
  • Base module: Terminal box (copper cable) + USB interface
  • Switching module: Terminal box (copper cable)
  • Termination module: Fieldbus box
Construction type / Ø shafts

Solid shaft (B5, B35) / Ø 14 mm with feather key

Device temperature range

-25 °C to +70 °C

Degree of protection



Approx. 3.6 kg + 0.8 kg/module

Device options
  • Modularly extendable (compact combination of different electronic function modules)
  • SIL 2 (DIN EN 61508); PL d (DIN EN ISO 13849); Category 3 (DIN EN ISO 13849) with USC 42
Mechanical options
  • Additional foot (solid shaft construction type)
  • MI: Saliferous environment
Special features and certificates

For USC 42: SIL 2 (DIN EN 61508); PL d (DIN EN ISO 13849); Category 3 (DIN EN ISO 13849),  
system-wide two channel architecture incl. internal cross-checking



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