Application And Characteristics; (6Es7972-0Aa01-0Xa0) - Siemens SIMATIC S7-300 Reference Manual

Programmable logic controllers module data

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RS 485 Repeater

Application and Characteristics;

(6ES7972-0AA01-0XA0)

Order number

6ES7972-0AA01-0XA0

What is an RS 485 repeater?

The RS 485 repeater amplifies data signals on bus lines and interconnects bus

Application of the RS 485 repeater

You need an RS 485 repeater if:

• More than 32 nodes are connected to the bus

• Bus segments are to be operated non-grounded on the bus, or

• The maximum cable length of a segment is exceeded. (See table 7-1).

9.6 to 187.5 kbd

3 to 12 Mbaud

If you configure the bus with RS 485 repeaters:

• Up to 9 RS 485 repeaters can be connected in series.

• The maximum cable length between two nodes must not exceed the values in

9.6 to 187.5 kbaud

3 to 12 Mbaud

Maximum Cable Length of a Segment

Maximum Cable Length between Two RS 485 Repeaters

Maximum Length of Cable between 2 Nodes (in m) with

Max. Cable Length of a Segment (in m)

RS 485 Repeater (6ES7972-0AA01-0XA0)

Programmable Logic Controllers S7-300 Module Data

A5E00105505-03

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