Siemens PROFIBUS Diagnostic Repeater Termination Guide

20 August 2026

The Siemens Diagnostic Repeater provides additional diagnostic capabilities that can help detect and locate line faults while a PROFIBUS network is operating. Correct configuration, wiring and termination are important for both network communication and effective diagnostics.

This technical specification provides an overview of the Siemens SIMATIC Diagnostic Repeater and guidance on its correct wiring and termination within a PROFIBUS DP network.

This technical specification covers:

  • Diagnostic Repeater overview and technical specifications
  • Operating elements and switch functions
  • Line diagnostics and fault location
  • PROFIBUS addressing and status LEDs
  • Termination settings
  • Maximum monitorable line length and cascading depth
  • Valid and invalid network arrangements
  • Four Diagnostic Repeater wiring configurations
  • Connecting the PROFIBUS cable

Latest Revision: 1.1
Last Updated: September 2026

View Technical Specification
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