3.1 Mounting and Connections
251
7UM61 Manual
C53000-G1176-C127-3
Figure 3-9
Position of the plug-in jumpers for configuration of terminating resistors of the Profibus interface
The terminating resistors can also be connected externally (e.g. to the connection
module). In this case the terminating resistors provided on the RS485/Profibus inter-
face module or directly on the B–CPU processor PCB must be switched out.
It is possible to convert the R485 interface to a RS232 interface by changing the
jumper positions and vice-versa.
The jumper positions for the alternatives RS232 or RS485 (as in Figure 3-8) are
derived from the following Table.
Table 3-13
Configuration for RS232 or RS485 on the interface module
The jumpers X5 to X10 must be plugged in the same way!
When the device is delivered from the factory, the jumper settings correspond to the
configuration ordered.
3.1.2.5
Reassembly
The device is assembled in the following steps:
• Insert the modules carefully in the housing. The installation locations of the boards
are shown in Figures 3-1 to 3-2. For the surface mounting device, press the metal
lever when inserting the B–CPU processor PCB. This facilitates connector inser-
tion.
• First, plug the connector of the ribbon cable onto the input/output module I/O and
then onto the B–CPU processor module. Be careful that no connector pins are bent!
Do not apply force!
• Insert the plug connector of the ribbon cable between the B–CPU processor module
and the front cover into the socket of the front cover.
• Press the plug connector interlocks together.
• Replace the front panel and screw it tightly to the housing.
• Replace the covers again.
• Screw tightly again the interfaces on the device rear. This is not necessary if the
device is designed for surface mounting.
Jumper
X5
X6
X7
X8
X10
X11
X12
X13
RS232
1-2
1-2
1-2
1-2
1-2
2-3
1-2
1-2
RS 485
2-3
2-3
2-3
2-3
2-3
2-3
1-2
1-2
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