Configuration, programming
4.4 IP configuration
CP 1543-1
36 Operating Instructions, 12/2019, C79000-G8976-C289-08
4.4 IP configuration
4.4.1 Points to note about IP configuration
Configured S7 and OUC connections cannot be operated if the IP address is assigned using DHCP
Note
If you obtain the IP address using DHCP, any S7 and OUC connections you may have
configured will not work. Reason: The configured IP address is replaced by the address
obtained via DHCP during operation.
4.4.2 Restart after detection of a duplicate IP address in the network
To save you timeconsuming troubleshooting in the network, during startup the CP detects
double addressing in the network.
Behavior when the CP starts up
If double addressing is detected when the CP starts up, the CP changes to RUN and cannot
be reached via the Ethernet interface. The ERROR LED flashes.
4.4.3 IP routing
IP routing via the backplane bus
The CP supports static IP routing (IPv4) to other CMs/CPs:
● CP 1545-1
● CM 1542-1 V2.0
● CP 1543-1 V2.0
You can use IP routing, for example, for Web server access by lower-level modules.
With IP routing, the data throughput is limited to 1Mbps. Remember this in terms of the
number of modules involved and the expected data traffic via the backplane bus.
Configuration
You can activate the IP routing in STEP 7 via the following parameter:
"Ethernet interface > Ethernet addresses > IP routing between communication modules"
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