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2.4.5 Connection possibilities
Connecting
diagram
Fig. 2-11
An additional expansion module (EXM 438/EXM 438-1 or EXM 448) can
LE-bus connection
be inserted at this 5 x 24 pin socket connector.
The 5 x 17 pin socket connectors is used to connect to the SIMATIC S7
P-bus connection
backplane (only power supply).
PROFIBUS-DP (X1)
The following connections are provided at the 9-pin sub-D socket:
• PROFIBUS interface with RS 485 format with electrical isolation
• Parameterizing- and diagnostics interface with RS 232 format to
• 5V power supply for the Optical Link Module (OLM)
2-34
EXM 448
Option module
(e.g. SLB SIMOLINK)
PROFIBUS-DP
Connection possibilities for the communications expansion module EXM 448
(floating)
download the bus configuration
with electrical isolation
Note:
Please refer to the documentation provided
with the option module for the connection
possibilities, connector assignments and
cables!
9 pin
Connector assignments:
RS 232 (download)
RS 485 (PROFIBUS)
+Tx/Rx = 3
-Tx/Rx = 8
Application Module FM 458 - User Manual
6DD1904-0AE0
Edition 12.2001
TxD = 2
RxD = 7
Grd = 1
Grd = 5
+5 V = 6
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