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2 possible configurations with the rs-485 repeater – Siemens SIMATIC NET PROFIBUS User Manual

Page 172

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Active Components for RS-485 Networks

5-6

PROFIBUS Networks SIMATIC NET

6GK1970-5CA20-0AA1 Release 2 05/2000

5.2

Possible Configurations with the RS-485 Repeater

Overview

The following section explains the configurations in which you can use the RS-485
repeater:

S

Segment 1 and Segment 2 terminated on the RS-485 repeater (see Figure 5-3)

S

Segment 1 terminated on the RS-485 repeater and segment 2 connected
through on the RS-485 repeater (see Figure 5-4 )

and

S

Segment 1 and Segment 2 connected through on the RS-485 repeater (see
Figure 5-5 )

Terminating Resistor On/Off

Figure 5-2 shows the setting for the terminating resistor:

Terminating resistor
On:

Terminating resistor
Off:

Figure 5-2

Setting of the Terminating Resistor