Mounting and Commissioning
3.1 Mounting and Connections
SIPROTEC, 7SJ61, Manual
C53000-G1140-C210-1, Release date 02.2008
280
IEC 60870–5–103 redundant
Figure 3-13
Location of the jumpers for configuration of the terminating resistors
Termination
Busbar capable interfaces always require a termination at the last device to the bus, i.e. terminating resistors
must be connected. On the 7SJ61 device, this applies to variants with RS485 or PROFIBUS interfaces.
The terminating resistors are located on the RS485 or Profibus interface module mounted on the processor
input/output board CPU (serial no. 1 in Figure 3-3).
With default setting the jumpers are set such that the terminating resistors are disconnected. Both jumpers of
a board must always be plugged in the same way.
The terminating resistors can also be connected externally (e.g. to the connection module), see Figure 3-14.
In this case, the terminating resistors located on the RS485 or Profibus interface module or directly on the PCB
of the processor module CPU must be switched OFF.
Figure 3-14
Termination of the RS485 interface (external)