Siemens SIPROTEC 7VU681, User Manual

Page: 73 / 112

Mounting And Commissioning
3.1 Mounting And Connections
SIPROTEC, 7VU681, User Manual
C53000-G1176-C368-1, Release Date 07.2012 73
EN100 Ethernet Module (IEC 61850)
The Ethernet interface module has no jumpers. No hardware modifications are required to use it.
Interface Termination
For bus-capable interfaces a termination is necessary at the bus for each last device, i.e. terminating resistors
must be connected. With the 7VU681 device, this concerns the variants with RS485 or PROFIBUS interfaces.
The terminating resistors are located on the RS485 or Profibus interface module, which is on the C-CPU-2
board (1) in Figures 3-2), or directly on the PCB of the C-CPU-2 board (see margin title "C-CPU-2 Processor
Board", Table 3-3).
The module for the RS485 interface is shown in Figure 3-9, the module for the Profibus interface in Figure 3-
10.
On delivery the jumpers are set so that the terminating resistor are disconnected. Both jumpers of a module
must always be plugged in the same way.
Figure 3-8 Position of Terminating Resistors and the Plug-in Jumpers for Configuration of the RS485
Interface
Figure 3-9 Position of the Plug-in Jumpers for the Configuration of the Terminating Resistors at the
Profibus (FMS and DP), and Modbus Interfaces
The terminating resistors can also be connected externally (e.g. to the terminal block), see Figure 3-5. In this
case, the matching resistors located on the RS485 or PROFIBUS interface module or directly on the PCB of
the C-CPU-2 board of must be disabled.