Siemens SIMATIC PROFINET Function Manual page 206

Functions
5.9 Standard machine projects
The following figure shows the above-described settings for the IP address and PROFINET
device name.
①
②
Figure 5-79
How an IO device obtains an IP address locally
Below, you will find an explanation of the "IP address is set by the IO controller during
runtime" and "IP address is set directly at the device" options, which can generally be
configured for a multiple use IO system.
If you have set the "Multiple use IO system" option for the IO system, STEP 7 automatically
sets the "IP address is set by the IO controller during runtime" option for the IO devices.
In this case, the IO controller assigns the IO device an IP address that results from the
locally assigned IP address of the IO controller (see next section). This option is appropriate
if the IO device is a field device, e.g., ET 200MP, ET 200SP, ET 200AL, or another
distributed I/O system.
If the IO device is not a "standard" field device, for example, an HMI device for a Windows
operating system, the "IP address is set by the IO controller during runtime" option described
above does not work. In this case, choose the "IP address is set directly at the device"
option. You must then assign the IP address to the device locally and take steps to ensure
that this address is suitable for the IP addresses of the other IO devices and the IP address
of the IO controller.
206
After the configuration is loaded from the standard machine project, the IO controller has no
device name and no IP address.
Following loading, the IO devices have a device name and a device number but no IP address.
Settings for the IP address and the PROFINET device name
PROFINET with STEP 7 V14
Function Manual, 09/2016, A5E03444486-AG