Siemens SIMATIC NET PROFIBUS manual Ungrounded Operation of the RS-485 Repeater

Active Components for RS-485 Networks

5.4Ungrounded Operation of the RS-485 Repeater

Ungrounded Operation

Ungrounded operation means that chassis and PE are not connected.

The ungrounded operation of the RS-485 repeater allows you to operate electrically isolated bus segments.

Figure 5-8 shows the change in the potentials resulting from using the RS 485 repeater.

Signals

ungrounded

Signals grounded

Figure 5-8 Ungrounded Operation of Bus Segments

5-12	PROFIBUS Networks SIMATIC NET
	6GK1970-5CA20-0AA1 Release 2 05/2000