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Pepperl+Fuchs Podcasts

Pepperl+Fuchs’ TechTalk helps listeners gain an insight into modern automation technologies by focusing on AS-Interface (Actuator Sensor Interface) and its associated safety technology, Safety at Work. TechTalk covers topics that range from hardware selection to installation and maintenance. Control engineers familiar with AS-Interface will get the latest news on specification enhancements, hear about new products, and familiarize themselves with established and cutting-edge troubleshooting methods, tips, and tricks.  Users who are interested in applying these technologies will learn what it takes to set up an AS-Interface system, how Safety at Work improves safety systems, and why those technologies have the potential to save time and money during all phases of a project.

Jun 8, 2015

While AS-Interface has been designed to operate without termination, there are cases where a terminator for AS-Interface can be quite useful.  Recall that AS-Interface network segments must not be longer than 100 m.  Violating this limit causes reflections at the end of the network resulting in communication issues, causing the network to run increasingly less stable.

  • --Using an AS-Interface terminator at the end of the network can help reduce reflections and thus in many cases allows network segments to be up to 200 m long
  • --Only one terminator must be used per segment
  • --Always put the terminator at the “opposite side” of the AS-Interface power supply
  • --Do not use a terminator if the segment is 100 m or shorter