3.1 Installation and Connections
333
7UM62 Manual
C53000-G1176-C149-3
The order numbers of the exchange modules can be found in the Appendix in Section
A.1.1 Accessories.
Serial Interfaces
with Bus Capability
If the device variant used has interfaces with bus capability, the bus should be
terminated with resistors at the last device on the bus. In the case of the 7UM62, these
are variants with RS485 or Profibus interfaces.
The terminating resistors are located on the RS485 or Profibus interface module,
which is on the C–CPU–2 board (
in Figure 3-5 and 3-6), or directly on the p.c.b. of
the CPU–2 board (see Section 3.1.3.3 under the side title “Processor Printed Circuit
Board C–CPU–2“, Table 3-6).
Figure 3-12 shows a view of the C–CPU–2 board with the location of the modules.
The module for the RS485 interface is shown in Figure 3-13, the module for the
Profibus interface in Figure 3-14.
On delivery the jumpers are set so that the terminating resistors are switched out. Both
jumpers of a module must be set on the same position.
Table 3-18
Exchange Interface Modules
Interface
Location
Exchange Module
System Interface
B
RS232
RS485
FO 820 nm
Profibus DP RS485
Profibus DP twin ring
Modbus RS485
Modbus 820 nm
DNP3.0, RS485
DNP3.0, 820 nm
Analog Interface
2 x 0 to 20 mA
Service InterfaceT
C
RS232
RS485
Analog Interface
D
2 x 0 to 20 mA
