Hello everyone, I am having trouble remotely connecting to a TIA Portal PLC. While I am able to ping it successfully, I am unable to establish a connection using my software. I have tried opening port 102 after conducting some online research, but I am still facing difficulties. Do I need to open both TCP and UDP ports for the connection to work? Before addressing any other setup issues, I want to verify if I am opening the correct port and if that is the only port that needs to be opened. Any assistance would be greatly appreciated.
When it comes to data transfer via TCP and UDP, it's important to know which ports are used for different services. Additionally, it's crucial to be mindful of how routers and firewalls can impact your connection. While setting up a CPU in TIA and connecting to the internet, be sure to search for 'Devices with a similar address' rather than 'Compatible Devices'. This simple switch in search terms can make a big difference in finding the right information.
TCP port 102 is commonly used for programming S7 PLCs. Which specific PLC model and TIA version are you working with? If your TIA version is V17 or above, have you enabled TLS on the CPU? This step is crucial for ensuring secure communication between devices.
Is the Programmable Logic Controller (PLC) visible within the online access folder in the project tree? Can you ping the address even if the PLC is disconnected or not powered up? This could indicate an IP conflict. Sometimes, the TIA software fails to renegotiate adapter settings, so it's important to ensure that your IP address is within the same network (particularly in the second half of the address) and that you are on the same subnet. It is common to experience difficulties if the subnet settings are different.
JesperMP mentioned that TCP port 102 is typically used for programming S7 PLCs. It's important to specify the exact PLC model and TIA version being used. For TIA versions V17 or higher, ensuring that TLS is selected on the CPU is crucial. Puddle suggested checking if the PLC is visible in the online access folder and troubleshooting IP conflicts. It's also important to verify that the IP address is on the same subnet. It seems like there may be a firewall issue, so confirming the correct port number (TCP 102) for communication is essential. Thank you for the helpful insights!
Are you connecting through NAT or traditional routing methods? How is your connection established?
Hi there! You're on the right track with opening port 102 as it's the standard TCP port used for ISO transport in Siemens S7-300 and S7-400 PLCs. However, TIA Portal primarily utilizes TCP for communication, so you may not need to concern yourself with UDP. I'd suggest confirming if your firewall isn't blocking the connection. Also, check your PC's IP settings to ensure it's aligned with your PLC's subnet. If the problem persists, it might be a software-related issue and not a networking problem. Double-check your TIA Portal configuration for any potential mistakes too.
Hey there! In the Siemens environment, where I presume you're working since you mentioned the TIA Portal, port 102 is indeed the primary one used for S7 communications. So, you're on the right track there. This should be a TCP port, not UDP, as data transmission needs to be both reliable and ordered. However, make sure that your gateway/firewall settings don't block this port. Also, it may be worthwhile checking your software settings once more just to ensure there are no anomalies there. Beyond this, it could be helpful to look at other potential network issues. Best of luck!
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Answer: Answer: The port commonly used for connecting to a TIA Portal PLC is port 102. It is advisable to open this port to establish a remote connection.
Answer: Answer: In most cases, opening port 102 for TCP communication should be sufficient for establishing a remote connection to the TIA Portal PLC. Opening UDP ports is usually not necessary for this purpose.
Answer: Answer: If you have opened port 102 and still face difficulties connecting, ensure that there are no firewall restrictions blocking the communication. Additionally, verify the correct IP address of the PLC and ensure that the software settings match the PLC configuration.
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