Device configuration
5.7 Configuring the CPU for communication
S7-1200 Programmable controller
System Manual, 03/2014, A5E02486680-AG
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PROFINET address assignment at system start-up
The controller broadcasts the names of the devices to the network, and the devices respond
with their MAC addresses. The controller then assigns an IP address to the device using
PROFINET DCP protocol:
● If the MAC address has a configured IP address, then the station performs start-up.
● If the MAC address does not have a configured IP address, STEP 7 assigns the address
that is configured in the project, and the station then performs start-up.
● If there is a problem with this process, a station error occurs and no start-up takes place.
This situation causes the configurable time-out value to be exceeded.
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