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Why profinet needs BOTH name and address?

3/14/2023 10:23 AM	Rate (0)
KevinNfoDrives Member Joined: 6/28/2022 Last visit: 4/18/2024 Posts: 27 Rating: (0)	When connecting with profinet devices, why do i need to put in the correct name AND address, shouldnt one of them be enough? Maybe im misunderstanding how things work/should-work. In a profinet device, if you check their Properties > PROFINET interface > Ethernet Addresses > IP Protocol; you can select "Set IP address in the project" and "IP address is set directly at the device". The way i interpreted these options is that if i set IP address in the project then the program will search for the device on that specific IP address, then assign the name from the program to the device. But if i select "IP address is set directly at the device" then the program uses the device name instead of the IP address and will find the device based on name then assign the IP address to that device? However, my device can only be identified if i have "Set IP address in the project" selected and i have BOTH the address and name correct. Isnt it redudant to have both an adress and a name? Why both? And whats up with the options under "IP protocol"?
	Last edited by: KevinNfoDrives at: 03/14/2023 10:24:27
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3/14/2023 11:43 AM	Rate (1)
ElonksuM_SN_BN Regular Member Joined: 5/6/2022 Last visit: 11/8/2024 Posts: 489 Rating: (98)	Hi KevinNfoDrives, From my knowledge, in profinet the devices are identified by their device name but in the end profinet is based on TCP/IP and that is why it is also necessary to have an associated IP address. As a support, I am going to share with you the following FAQ that might be useful: "Assigning names and addresses in PROFINET IO" I hope so, best regards!
	If this Information really helps, you could use the Rate function Thank you.
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3/14/2023 12:17 PM	Rate (1)
Stefan Arcularius Platinum Expert Joined: 1/21/2013 Last visit: 11/10/2024 Posts: 3253 Rating: (505)	Hi KevinNfoDrives, PROFINET uses only layers 1, 2 and 7 of the OSI model for real-time communication. Therefore, no IP address is required and addressing is based on the MAC address only. Since the MAC address changes when devices are exchanged, the device name is defined during engineering. When the IO Controller starts up, it looks for devices with the known device name to know how to address them by their MAC address. Since configuration and diagnostic data does not need to be transferred in real time and will use larger data packets, this type of communication is IP based. This is why the IP address is needed. If you use a different IP address, the real-time communication will still work, but you will no longer be able to receive diagnostic data within your engineering tool, e.g. TIA Portal. Kind regards Stefan

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