Siemens Siprotec 7UM611 Manual page 250

3 Mounting and Commissioning
Table 3-12
Interface
System interface
Service interface
The order numbers of the exchange modules can be found in the Appendix in Section
A.1.
Serial Interfaces For bus-capable interfaces a termination is necessary at the bus for each last device,
with Bus Capability i.e. termination resistors must be connected. In the case of the 7UM61, these are vari-
ants with RS485 or Profibus interfaces.
The terminating resistors are located on the RS485 or Profibus interface module,
which is on the B–CPU processor board ((1) in Figure 3-1 and 3-2), or directly on the
p.c.b. of the B_CPU processor PCB (see under margin heading "Processor module
B–CPU", Table 3-2).
Figure 3-7 shows the B–CPU PCB with location of the modules.
The module for the RS485 interface is shown in Figure 3-8, the module for the Profibus
interface in Figure 3-9.
On delivery the jumpers are set so that the termination resistors are disconnected.
Both jumpers of a module must always be plugged in the same way.
Figure 3-8
250
Replacement modules for interfaces
Mounting Location / Port
B
C
Position of terminating resistors and the plug-in jumpers for configuration of the
RS485 interface
Replacement module
RS232
RS 485
FO 820 nm
Profibus DP RS485
Profibus DP double ring
Modbus RS 485
Modbus 820 nm
DNP3.0, RS 485
DNP 3.0 820 nm
RS232
RS 485
FO 820 nm
C53000-G1176-C127-3
7UM61 Manual