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Configuration, program blocks
4.3 IP configuration
IP configuration with CM 1542-1 as PROFINET IO controller
If the CM with enabled IPv4 routing is used as PROFINET IO controller via the backplane bus,
observe the following for IP configuration of the lower-level IO devices:
If the IP address of the lower-level IO devices was configured permanently (option "Set IP
address in the project"), no IPv4 routing via the CM to the IO devices is possible.
To enable IPv4 routing via the CM to the lower-level IO devices, the following must be set in
the IP configuration of the IO devices:
• First, enable the "Use router" option on the IO device.
Copy the IP address of the IO controller (CM) into the router address field.
• Then, enable the "IP address is set directly at the device" option on the IO device.
4.3.4
CM in multiple use IO systems (standard machines)
Multiple use IO system in standard machines
In PROFINET IO controller mode, the CM can be used in standard machines of the same type.
After configuration, the address parameters of the CM are adapted to the required settings.
With suitable configuration of the CM, the lower-level IO devices adopt the address
parameters from the CM.
Requirements in the configuration
In terms of configuration it is assumed that the standard machine is delivered with a
configured PROFINET IO system and the CM is the IO controller to which several IO devices
are assigned in the PROFINET IO system.
The following requirements must be met in the configuration:
• PROFINET IO system
In the configuration of the PROFINET IO system, the option "Multiple use IO system" was
activated in the "General" tab. This makes the IO system a standard machine project in the
STEP 7 project.
• IO controller (CM) > PROFINET interface
– In the Ethernet addresses of the CM, the following option is activated under
– In the advanced options the following option is activated in the interface options:
• IO devices > PROFINET interface
With the lower-level IO devices there are also some settings to be made that are described
in the STEP 7 information system.
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"PROFINET": "PROFINET device name is set directly at the device"
"Permit overwriting of device names of all assigned IO devices"
Operating Instructions, 04/2023, C79000-G8976-C355-05
SIMATIC CM 1542-1
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