Siemens S7-400PLC Especificaciones Pagina 407

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RS 485 repeater
10.4 RS 485 repeater in ungrounded and grounded operation
S7-400 Automation System Module Data
Reference Manual, Edition 09/2009, A5E00850736-06
407
Connection scheme
In a repeater configuration with ungrounded reference potential (ungrounded operation), any
interference currents and static charges are discharged to the protective conductor by
means of an RC network integrated in the repeater (refer to the figure below).
1
DC
24 V
L+ M PE
M 5.2
A1
B1 A1 B1
M
22 nF
10 MΩ
PE
(1) Ground busbar
Figure 10-1 RC network with 10 M Ohm for configuration with ungrounded reference potential
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