Testing The Profinet Network - Siemens S7-1200 System Manual

Device configuration
5.7 Configuring the CPU for communication
Condition in which PROFINET network might stop
When changing the IP address of a CPU online or from the user program, it is possible to
create a condition in which the PROFINET network might stop.
If the IP address of a CPU is changed to an IP address outside the subnet, the PROFINET
network will lose communication, and all data exchange will stop. User equipment may be
configured to keep running under these conditions. Loss of PROFINET communication may
result in unexpected machine or process operations, causing death, severe personal injury,
or property damage if proper precautions are not taken.
If an IP address must be changed manually, ensure that the new IP address lies within the
subnet.
5.7.5

Testing the PROFINET network

After completing the configuration, download the project (Page 196) to the CPU. All IP
addresses are configured when you download the project.
Assigning an IP address to a device online
The S7-1200 CPU does not have a pre-configured IP address. You must manually assign an
IP address for the CPU:
● To assign an IP address to a device online, refer to "Device configuration: Assigning an
IP address to a CPU online" (Page 158) for this step-by-step procedure.
● To assign an IP address in your project, you must configure the IP address in the Device
configuration, save the configuration, and download it to the PLC. Refer to "Device
configuration: Configuring an IP address for a CPU in your project" (Page 159) for more
information.
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WARNING
S7-1200 Programmable controller
System Manual, 03/2014, A5E02486680-AG