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Lost Communication between PLC and HMI

12/6/2023 10:00 AM	Rate (0)
ahi_77 Experienced Member Joined: 10/23/2015 Last visit: 8/15/2025 Posts: 168 Rating: (2)	Dear All, I have a problem of communication between a PLC S-1517 and an HMI MTP1500. The programmation is done with a TIA V17. The problem is due to the securty certificate I have the follwing error message: PLC certificate is untrusted , manual trust is impossible for trust - Open aborted due to invalid state of SPlusConnection Error code = 50 Thanks

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12/6/2023 11:20 AM	Rate (0)
Towome Platinum Member Joined: 7/9/2015 Last visit: 8/29/2025 Posts: 4443 Rating: (641)	Hi, please have a look to the following entry - this could be the solution for your problem - if not, please tell us! No connection to PLC after WinCC Panel Images V17 Update 6 Regards, Towome
	If my post was useful, please rate me - if not, please tell me - thank you!
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This contribution was helpful to 2 thankful Users Stefan Arcularius Murof

12/14/2023 10:53 AM	Rate (0)
Murof Platinum Expert Joined: 8/3/2009 Last visit: 9/4/2025 Posts: 16343 Rating: (1931)	Hello ahi_77 check if you use in your HMI project the latest Image version that is available for the panel and not an older one like a 16 or similar Check the clock settings in your plc and HMI they has to be set correctly so that there are no problems with the certificate´s validity timerange Bye Murof
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2/10/2025 10:05 PM	Rate (0)
Erik2004 Advanced Member Joined: 4/15/2016 Last visit: 2/11/2025 Posts: 10 Rating: (0)	I noticed the same problem. I have two plc's with the indentical plc programm. when using a one hmi panel,i am able to connect to one plc. But not the second. with the second one i am getting also alarm code 50

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