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Error: “Cannot connect to PLC – Open aborted due to invalid state of S7PlusConnection”

Created by: FIKRIALFATAH at: 3/22/2024 1:56 AM (6 Replies)

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3/22/2024 1:56 AM	Rate (0)
FIKRIALFATAH Joined: 12/21/2023 Last visit: 5/17/2025 Posts: 3 Rating: (0)	I'm having a similar problem. I've checked the certificate. even when I create a new project it still can't connect. ------------------------------------------------------------------------------------------ Split from WinCC unified to PLC via S71200/1500 Communication.
	Last edited by: Jen_Moderator at: 03/25/2024 05:33:49 New subject after splitting
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This contribution was helpful to 1 thankful Users UC2912

3/22/2024 6:52 AM	Rate (0)
Stefan Arcularius Platinum Expert Joined: 1/21/2013 Last visit: 8/29/2025 Posts: 4087 Rating: (632)	Hi FIKRIALFATAH, Some basics to check: Certificate validity. Make sure both devices are set to the correct time. Verify that any hardware changes have been downloaded to the device. If this does not solve your problem, please provide more details such as error code, device version, etc. Kind regards Stefan

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3/25/2024 4:28 AM	Rate (0)
FIKRIALFATAH Joined: 12/21/2023 Last visit: 5/17/2025 Posts: 3 Rating: (0)	I use TIA Portal Unified V18, CPU S7-1500 : 6ES7511-1AL03-0AB0 with firmware v3.0 and HMI Unified : 6AV2128-3MB06-0AX1 with firmware v17.0.0.0 error code: -6484550144544604418 Attachment IMG-20240325-WA0006.jpg (738 Downloads)

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3/25/2024 6:29 AM	Rate (0)
Stefan Arcularius Platinum Expert Joined: 1/21/2013 Last visit: 8/29/2025 Posts: 4087 Rating: (632)	Hi FIKRIALFATAH, Have you performed the checks I listed in my previous post? What is the access level configured for your PLC? You can find this in the PLC properties under "Protection & Security". If your configuration is set to "No access", you will need to enter the password configured for your HMI connection. I recommend that you install at least image version V18, Update 3 on your device and make a device change to version V18.0.0.3 in your project. To do this, you must have Update 3 installed for your engineering. Kind regards Stefan

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3/26/2024 6:03 AM	Rate (0)
FIKRIALFATAH Joined: 12/21/2023 Last visit: 5/17/2025 Posts: 3 Rating: (0)	I've done everything, and finally the problem was resolved after I updated the device OS to version V18 update 3 (V18.0.0.3) and updated the TIA Portal version to V18 update 3. Thank you for all the solutions you have provided

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4/24/2025 11:13 AM	Rate (0)
TajinderSingh281088 Joined: 12/26/2024 Last visit: 8/25/2025 Posts: 5 Rating: (0)	Hi i am getting the error-121 even i have validate certificate.Here i am using V19 Upd2. Attachment Error121.png (145 Downloads)

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4/29/2025 1:45 PM	Rate (0)
Murof Platinum Expert Joined: 8/3/2009 Last visit: 9/2/2025 Posts: 16287 Rating: (1930)	TajinderSingh281088 Hi i am getting the error-121 even i have validate certificate.Here i am using V19 Upd2. Hello TajinderSingh281088 Which PLC and FW version do you use? Which Image Version on the HMI panel? Is date/time set properly on Panel and PLC? Bye Murof
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