3 Mounting and Commissioning
390
7SA522 Manual
C53000-G1176-C155-3
Interface
PROFIBUS
Figure 3-11 Position of the plug-in jumpers for the configuration of the terminating resistors at the interfaces Profibus
(FMS and DP) and DNP3.0 interface
RS485 Termination Busbar capable interfaces always require a termination at the last device to the bus,
i.e. terminating resistors must be connected. With the 7SA522 device, this concerns
the variants with RS485 or PROFIBUS interfaces.
The terminating resistors are located on the RS485 or Profibus interface module that
is mounted to the C-CPU-1 board (serial no. 1 in Figures 3-3 to 3-4).
Figure 3-8 shows the C-CPU-1 PCB with the layout of the boards.
The board with configuration as RS485 interface is shown in Figure 3-10, the module
for the PROFIBUS interface in Figure 3-11.
For the configuration of the terminating resistors both jumpers have to be plugged in
the same way.
On delivery the jumpers are set such that the termination resistors are disconnected.
The terminating resistors can also be connected externally (e.g. to the terminal block),
see Figure 3-12. In this case, the terminating resistors located on the RS485 or
PROFIBUS interface module must be de-energized.
Figure 3-12 Termination of the RS485 interface (external)
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