Siemens PROFIBUS Standard Repeater Termination Guide

12 August 2026

Repeaters are used in PROFIBUS networks to link segments, extend network distances and regenerate signals. Correct installation, wiring and termination are important for maintaining reliable communication between network segments.

This technical specification provides an overview of the Siemens SIMATIC RS-485 Repeater and guidance on its correct installation, wiring and termination within a PROFIBUS DP network.

This technical specification covers:

  • SIMATIC RS-485 Repeater overview and technical specifications
  • Repeater design and functions
  • Installation and removal
  • Connecting the PROFIBUS cable
  • RS-485 repeater rules
  • Termination resistor settings
  • Four wiring configurations
  • PG port and powering off bus segments
  • Standard versus Diagnostic Repeater

Latest Revision: 1.1
Last Updated: September 2026

View Technical Specification
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