Sensor-Technik electronic controllers : awarded 6 key industry safety approvals

Sensor-Technik Wiedemann (STW) have achieved 6 important safety approvals for their current generation of 32 bit mobile control units, in accordance with the following industry recognised machine safety standards:-

  • EN 61506
  • SIL2
  • EN62061 SIL C2  
  • EN ISO 13849 PLd


  • 19th September 2013 – The first approval for the unique memory protection mechanism for the electronic control unit ESX®-3XL received.

The application software can access both standard and safety functions in parallel.

  • October 2013 – The SIL2/PLd approval was received for the STW implemented CANopen Safety (ECoS) Protocol.

Safety data can be transferred at system level between safety components, for example sensors, actuators or across decentralised control networks.

  • February 2014 – STW received the SIL2/PLd certificate for the ESX-3XM electronic control unit.

Both safety and standard I/Os can be controlled on one control unit, and the safety functionality is protected from interference. With this, there are literally millions of feasible control unit variants available through the inclusion of approved expansion boards. Additional I/O, RS232/RS485, CAN, Ethernet and USB functionality can be all added without compromising the safety functionality or certification.

Currently there are 14 expansion boards (EBs), which can be used for independent standard functions. The first Safety Expansion Board (according to DIN IEC 61508 and EN ISO 13849) is in development. This can be used in the ESX®-3XL and ESX®-3XM basis for SIL 2/PL d functions. The Safety EB offers the following additional safe I/O functionality:

  • 16 safe digital High-Side outputs,
  • 16 safe digital or voltage inputs, and,
  • 2 safe analogue current inputs.

Potentially, up to 84 safe I/O channels available within one control unit.

  • 14th March 2014 – The first certificate for CODESYS Safety SIL 2 Runtime System for the ESX®-3XL was issued. For the first time, developers could develop a safety related IEC-61131 application on a mobile controller.

Being able to offer holistic, long term system solutions for the control of mobile machines, and having the unique safety concept confirmed and approved by the TÜV Süd is very satisfying, and I’m very pleased to have achieved these milestones”

       Mr. Wolfgang Wiedemann, Managing Director of Sensor-Technik Wiedemann GmbH.

Sensor-Technik UK Ltd

01234 270770

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