SiePortal

The integrated platform for your product selection, buying and support workflow - bringing together Industry Mall and Online Support.

Products & Services
- Menu temporary not available
- Menue temporary not available
- {{item.title}}
Support Support
{{(apiData.Support | filter:{'rank':1}:true)[0].title}} Support
- Menu temporary not available
- Menue temporary not available
- {{item.title}}
MySiePortal MySiePortal
{{(apiData.MySiePortal | filter:{'rank':1}:true)[0].title}} MySiePortal
- Menu temporary not available
- Menue temporary not available
- {{item.title}}
Cart ({{apiData.CartCount}})

Navigation

HMI/PLC untrusted

8/27/2025 3:23 PM	Rate (0)
Nuno_ Joined: 2/3/2025 Last visit: 8/27/2025 Posts: 52 Rating: (1)	Hi everyone, I'm using an S7-1214 DC/DC/DC and a KTP900 Basic. When I try to connect, the following messages appear on screen: 'Connection disconnected: HMI_Connection_1, Station 192.168.0.1, Rack 0, Slot 1.' 'PLC %hs is untrusted; manual trust is impossible; detail error code %d'. My PLC IP address is 192.168.0.1 and my HMI IP address is 192.168.0.2. I hope to hear from you soon.
	Nuno_
Suggestion To thank Quote Answer

8/28/2025 6:58 AM	Rate (0)
Hati Platinum Member Joined: 9/21/2012 Last visit: 9/1/2025 Posts: 4694 Rating: (509)	Since you are not letting us know what TIA version you are using, i'm taking a guess that yout TIA version is V17 or greather. Since V17 -> there are security certificates for communications. If your HMI panel version is V17 or greather, it's using the security certificate. You need to create the sertificate to the PLC, and then compile the hardware and download the hardware to the PLC and also download the HMI again. Then you also need to set the same date and time to both the PLC and HMI, for the comms to work.

Suggestion To thank Quote Answer

8/29/2025 11:46 AM	Rate (0)
Murof Platinum Expert Joined: 8/3/2009 Last visit: 9/2/2025 Posts: 16288 Rating: (1930)	Hello Nuno_ Could be also this topic: https://support.industry.siemens.com/cs/de/en/view/109803668 If you have activated the Secure HMI connection in the PLC you would also need the latest OS Update for the panel (V17.0.0.8): https://support.industry.siemens.com/cs/de/en/view/109825750 Bye Murof
	If this Information really helps, you could use the Rate function
Suggestion To thank Quote Answer

Share this page:

Share this page on...