Siemens SIPROTEC 7SD610 Manual page 285

Profibus/DNP/MODBUS Interface
Figure 3-10 Location of the jumpers for configuring the terminating resistors (PROFIBUS, DNP and MODBUS interface)
EN100 Ethernet Module (IEC 61850)
The Ethernet interface module has no jumpers. No hardware modifications are required to use it.
Termination
Bus-capable interfaces always require a termination at the last device on the bus, i.e. terminating resistors must
be connected. On the 7SD610 device, this concerns the variants with RS485 or PROFIBUS7/DNP/MODBUS
interfaces.
The terminating resistors are located on the interface module which is on the processor module C-CPU-2 (no.1
in Figure 3-3) or directly on the PCB of the processor module C-CPU-2 (see margin heading „Processor module
C-CPU-2", Table 3-7).
The interface modules are displayed in Figure 3-9 and in Figure3-10.
For the configuration of the terminating resistors both jumpers have to be plugged in the same way.
On delivery the jumpers are set so that the terminating resistors are disconnected.
The terminating resistors can also be implemented outside the device (e.g. at the terminal block), see Figure
3-11. In this case, the terminating resistors located on the interface module or directly on the PCB of the pro-
cessor board C-CPU-2 must be disconnected.
Figure 3-11
SIPROTEC, 7SD610, Manual
C53000-G1176-C145-6, Release date 02.2011
Termination of the RS485 Interface (External)
Mounting and Commissioning
3.1 Mounting and Connections
285