Technical data

Connecting
5.3 Connecting the bus cable
RS 485 Repeater
Manual, 02/2011, A5E03382072-01
21
5.3 Connecting the bus cable
Connecting the PROFIBUS cable
Connect the PROFIBUS cable to the RS 485 repeater, as follows:
1. Cut the PROFIBUS cable to the required length.
2. Strip the PROFIBUS cable as shown in the figure.
The braid shield must be folded back on to the cable. Only then can the shield clamp serve
as strain relief and as the shield contact.
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Figure 5-1 Stripping length for connecting to the RS 485 repeater
1. Connect the PROFIBUS cable to the RS 485 repeater:
Connect the same wires (green/red for the PROFIBUS cable) to the same terminal A or B
(in other words, always connect terminal A with a green wire and terminal B with a red
wire or vice versa).
2. Tighten the shield clamps so that the shield makes good contact with the clamp.
You can also find the stripping length printed on the RS 485 repeater:
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SIMATIC NET PROFIBUS cables
You can find an overview of the PROFIBUS cables and their mechanical and electrical
properties in the PROFIBUS system manual on the Internet
(http://support.automation.siemens.
com
/WW/view/en/35222591).