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About I-Device Communication

10/10/2023 12:09 AM	Rate (0)
AutoGen_5172335 Posts: 2 Rating: (0)	Hi experts. I have some questions about I-Device Communication over Profinet. 1) Is I-Device Communication over Profinet based on TCP/IP? And also ISO on TCP? 2) If the packet loss happens (because of bad condition of medium / wireless communication... etc), are there anyway PLC(or at least its communication part) can recover it (like doing re-transmission)? If the I-Device Communication is based on TCP/IP, it should re-transmit the data. However, if I consider the speed of the communication, the re-transmission might be limited, to my knowledge. 3) If the packet loss happens, and if the PLC fails to recover the lost packet, are there anyway PLC can detect it? Thanks for any help in advance. Have a good day!
AutoGen_5172335 Posts: 2 Rating: (0)	Last edited by: AutoGen_5172335 at: 10/10/2023 00:47:48
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10/10/2023 4:50 AM	Rate (0)
Stefan Arcularius Platinum Expert Joined: 1/21/2013 Last visit: 1/17/2026 Posts: 4406 Rating: (653)	Hi, An I-Device is an intelligent IO-Device. As with normal IO-Controller ↔ IO-Device communication in the PROFINET scope, the IO data is sent cyclically from the device to the controller. This is done based on the Ethernet protocol (without using IP, TCP or UDP). Since the I-Device sends the data in a defined cycle, the IO-Controller detects a communication failure due to a missing PROFINET telegram. If the number of missing telegrams exceeds a configured limit (default 3), the IO-Controller generates an alarm due to a missing IO-Device. Nevertheless, the IO-Controller continues to reach the device. Further information about the I-Device can be found in the function manual "PROFINET with STEP 7". Kind regards Stefan

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