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Asfinag shaft access system

KEYDATA (machine components):

Complete retrofit of control system

  • Beckhoff Embedded PC control system with TwinCAT PLC
  • 15“ touch-screen operating panel
  • Safety technology Beckhoff TwinSAFE and ABB Pluto safety control system
  • Radio transmission to the cabin using the Schildknecht DataEagle
  • Access protection using safety control systems
  • Shaft cover activation for air supply and ventilation shafts
  • Speech transmission between terminal and cabin
  • Interface with main control room (clearances and notifications)



  • Compilation of clearance documents
  • Project planning
  • Wiring diagrams
  • Operation manuals, servicing plans
  • Risk assessment and safety evaluation according to Machinery Directive EN 13849

Software development

  • PLC programming according to IEC 61131-3
  • Visualisation

Control installation

  • Control cabinet construction
  • Visualisation


  • Preparation of TÜV documents according to EN 13849
  • Plant handover
  • Training


Short project description:

We upgraded the entire control system for the shaft access installation of the Pfänder Tunnel on behalf of ASFINAG Alpenstrassen GmbH. The original machines dated back to approx. 1980 and had not been upgraded since.

The shaft access system serves to inspect the air supply and ventilation shafts in the tunnel and to perform rescue operations in the tunnel during emergencies.

The shaft access installations are 320 or 260m long and operate at a speed of 0.5m/s. Speed monitoring systems and safety brakes are handled by the safety control system.

The project was implemented over a period of approximately 4 months (January – April).