5 Installation and Commissioning 
 
Communication with S7 CPU via KNX Gateway 
Entry ID: 109739689,    V1.0,    06/2017 
 
 Siemens AG 2017 All rights reserved 
5.2.2  Installation under plant conditions 
Under “real” conditions, a SIMATIC controller is normally directly connected to a 
KNX gateway. The gateway is integrated into a PROFINET network via the two 
PROFINET interfaces and connected to the KNX network via the KNX interface. 
 
Figure 5-2: Installation under plant conditions 
PROFINET 1 / 2
IP: 192.168.0.2
RS 232/485
“Triple-X PROFINET + KNX”
universal gatewy
LAN
PN 
24V DC
S7-1200 CPU 
24V DC
IP: 192.168.0.1 
IP: 192.168.0.3 
KNX
+    -
PROFINET IE
KNX
KNX
power supply
+     -
L     N     PE
KNX
wall switch
+     -
KNX
room
control unit
+     -
230V AC