7-1
Programmable Logic Controllers S7-300 Module Data
A5E00105505-03
RS 485 Repeater
In this chapter
In this chapter, you will find a detailed description of the RS 485-Repeater.
Included in the description are:
• The purpose of the RS 485 repeater
• The maximum cable lengths possible between two RS 485 repeaters
• The functions of the individual operating elements and terminals
• Information about grounded and non-grounded operation
• Technical specifications and the block diagram
Further information
You will find further information on the RS 485 repeater in the manuals Hardware
and Installation in the Chapter “Configuring of an MPI or PROFIBUS-DP network”.
Diagnostic repeater
Compared to the RS 485 repeater, the diagnostic repeater has new characteristics:
Diagnostic function and modeling as the DP slave. For additional information, refer
to the Diagnostic Repeater for PROFIBUS-DP manual, order no.
6ES7972-0AB00-8xA0.
In this chapter
Section Contents Page
7.1 Application and Characteristics;
(6ES7972-0AA01-0XA0)
7-2
7.2 Appearance of the RS-485 Repeater; (6ES7972-0AA01-0XA0) 7-3
7.3 RS 485 Repeater in Ungrounded and Grounded Operation 7-4
7.4 Technical Specification 7-6
7
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