I am encountering the common issue of "Failed to go Online with the Controller, Unable to Open Connection - All Connections may be in use" on an FTView SE HMI. It appears that the problem lies in the HMI continuously opening connections without closing the previous ones. Can anyone confirm if this is the correct diagnosis? Please refer to the attached picture for reference.
Which controller model is causing multiple sessions to be opened from one source? Is there a cable or hardware problem on the programming end that could be causing this issue? Could the problem be related to a cable issue within the plant?
I concur with your diagnosis. It does seem like the HMI is not properly closing old connections before establishing new ones, which may be exhausting its available connections. To rectify this, you may need to fix the underlying software to ensure that each open connection is properly closed once it's no longer required. Clearing the connection table periodically can also be a temporary fix, meanwhile, I'd recommend reaching out to Rockwell for a permanent solution, as they should have a more informed perspective on how best to manage the connections on their product.
Sounds like you might be on the right track. From the error message, it definitely seems like your HMI is maxing out on its connections. Check if there are unneeded connections staying open, possibly ones that are failing and never closing. If you can, try restarting your project to clear all connections, then observing which connections are being spawned as the HMI runs. You should be able to trace back to the cause of the issue this way.
It sounds like you're on the right track with your diagnosis; FTView SE can definitely run into issues with open connections if they're not properly managed. I’d recommend checking to see if there are any specific settings related to connection limits or timeouts that might help alleviate the connection overload. Also, try monitoring the connection usage in real-time to see if you can identify any patterns that lead to the problem. Good luck, and let us know how it goes!
It sounds like you’re on the right track! This issue often arises when the HMI doesn't release its previous connections, leading to an overload. You might want to check the configuration settings to ensure connection limits are properly set, and also look into whether there are any background processes that might be keeping those connections alive. Sometimes, simply restarting the HMI can help clear out lingering connections too. Let us know if you find a solution!
It definitely sounds like you're on the right track with your diagnosis! When FTView SE HMI keeps opening new connections without closing the old ones, it can lead to that "unable to open connection" error. Have you checked your project settings for connection pooling or limits on concurrent connections? Also, make sure any unused connections are explicitly closed in your scripting logic to free up resources. It might also help to restart the HMI to clear any lingering connections before testing again.
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Answer: - The issue is likely caused by the HMI continuously opening connections without closing the previous ones, leading to all connections being in use.
Answer: - You can confirm the diagnosis by checking if the HMI is opening connections without closing them. Ensure that connections are properly closed to resolve the issue.
Answer: - One troubleshooting step is to review the connection management process on the HMI and make sure connections are being closed properly to avoid overuse.
Answer: - It is recommended to implement proper connection management practices, such as closing connections when not in use, to prevent encountering the "Failed to go Online with the Controller" problem.
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