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To be able to connect the CM to the network, you can remove the retentively stored IP
address as follows:
1. Set the CPU to STOP.
2. Remove the memory card of the CPU.
3. With SINEC PNI via DCP, set the IP address of the CM to 0.0.0.0 without configuration.
You have removed the retentively stored IP address of the CM. The CM can be integrated
into the network.
4. Insert the memory card in the CPU again.
4.3.3
IP routing
IP routing via the backplane bus
The function enables static IPv4 routing between communications modules in a rack via the
backplane bus. This means that routing between two subnets that are connected via two
communications modules of the station is enabled.
The function is supported by the following modules:
• CP 1545-1
• CM 1542-1
As of firmware version V2.0
• CP 1543-1
– As of firmware version V2.0 with disabled security functions
– As of firmware version V2.1 with enabled security functions
You can use IP routing, for example, for Web server access by lower-level modules.
With IP routing, the data throughput is limited to 1 Mbps. Remember this in terms of the
number of modules involved and the expected data traffic via the backplane bus.
Restrictions
IPv4 routing via the communications module into the CPU of the station is not possible.
Configuration
You reach the function in STEP 7 via:
"Ethernet interface > Ethernet addresses > IP routing between communications modules"
IP routing must be activated in at least 2 modules of a station.
IP routing runs via the configured default router.
Please note:
If you wish to use IP routing, you can only configure a router for one communications module
in the station.
SIMATIC CM 1542-1
Operating Instructions, 04/2023, C79000-G8976-C355-05
Configuration, program blocks
4.3 IP configuration
39
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