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PLC certificate is untrustworthy. Manual trust is possible.

Created by: AutoGen_2453759 at: 5/7/2025 10:05 AM (4 Replies)

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5/7/2025 10:05 AM	Rate (0)
AutoGen_2453759 Joined: 12/17/2024 Last visit: 5/16/2025 Posts: 2 Rating: (0)	Good Morning everybody! I'm experiencing an issue on TIA v19. I'm using a 1510SP CPU v3.1 and a TP1200 Comfort HMI. I created a project with only these 2 devices an everything is fine. However, when I try to copy these devices to our general project that contains more devices, when I try to run HMI simulation from my PC I can't connect and the message I get is "PLC certificate is untrustworthy. Manual trust is possible." How do I do that? Any ideas?

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5/7/2025 12:30 PM	Rate (0)
Wizard Diamond Expert Joined: 4/24/2006 Last visit: 7/31/2025 Posts: 9027 Rating: (1199)	Hi, Have you tried to compile all again (Rebuild All) Best regards, Wizard

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This contribution was helpful to 1 thankful Users AutoGen_2453759

5/9/2025 12:43 PM	Rate (0)
AutoGen_2453759 Joined: 12/17/2024 Last visit: 5/16/2025 Posts: 2 Rating: (0)	Yes I have, but with no result

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5/9/2025 1:44 PM	Rate (0)
Wizard Diamond Expert Joined: 4/24/2006 Last visit: 7/31/2025 Posts: 9027 Rating: (1199)	Hello, Perhaps the following link might help: No connection to PLC after WinCC Panel Images V17 Update 6 See point 2.5 And this thread: https://support.industry.siemens.com/forum/nl/en/posts/unified-comfort-1200-panel-problem-plc-certificate-untrusted-manual-trust-is-impossible/319585/?page=0&pageSize=10 Best regards, Wizard

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This contribution was helpful to 1 thankful Users AutoGen_2453759

5/16/2025 9:12 AM	Rate (0)
Murof Platinum Expert Joined: 8/3/2009 Last visit: 9/2/2025 Posts: 16290 Rating: (1930)	Hello you could also try to create a new certificate for the Secure HMI Communication in the security seetings of the PLC, then download again to PLC And HMI, or if you simulate both just start simulation. You need an integrated HMI Connection, so you can also try to delete the existing one and create a new HMI Connection to the PLC in TIA Portal. then rename it with the old name Bye Murof
	If this Information really helps, you could use the Rate function
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