Siemens SIPROTEC 6MD665, Manual, Page: 119 / 222

3.1 Installation and Connections
105
6MD665 Manual
C53000-G1876-C103-3
Interface D is only available with devices having the digit 5 in position 12 of the order
number.
Note
Please observe the following: Only interface modules with which the unit can be
ordered in accordance with the factory order code (see Appendix) can be used.
Table 3-5 Exchangeable interface modules
The order numbers of the replacement modules are listed in the Appendix.
Serial interfaces
with bus capability For bus-capable interfaces a termination is necessary at the bus for each last device,
i.e. termination resistors must be connected. In the case of the 6MD665, these are
variants with RS485 or PROFIBUS interfaces.
The termination resistors are connected to the corresponding PROFIBUS interface
module that is mounted to the processor module CPU.
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 3-6 Position of the plug-in jumpers for configuration of the terminating resistors of
the RS485 interface
Interface Insertion slot Replacement module
System interface E
RS485
FO 820 nm
PROFIBUS FMS RS485
PROFIBUS FMS Single ring
PROFIBUS FMS Double ring
DIGSI
®
Service interface C RS232/RS485
FO 820 nm
D FO 820 nm
Inter relay communication C RS485
Process bus interface B Ethernet profile 1