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time date problem

Created by: eem28 at: 2/25/2025 6:33 AM (6 Replies)

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2/25/2025 6:33 AM	Rate (0)
eem28 Joined: 1/7/2025 Last visit: 11/5/2025 Posts: 16 Rating: (0)	Hello, I am programming S7 1200 and unified basic panel with the help of tia portal v19. I set the plc and hmi clock. However, if the HMI is turned off for a long time (for example, 1-2 weeks), the time and date settings are disrupted. This is why hmi and plc do not communicate. Once you set the time and date in the screen settings, it communicates again. What is the reason for this? Thanks

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2/25/2025 7:18 AM	Rate (0)
Towome Platinum Expert Joined: 7/9/2015 Last visit: 1/7/2026 Posts: 4493 Rating: (644)	Hi, Perhaps this is the reason: For an HMI with firmware V17.0.0.6 to be able to establish a connection to a controller with SSL/TLS encryption, the date and time of the HMI must be within the validity period of the SSL/TLS certificate of the controller. If the date and time on the HMI are up to date, a connection to the controller should be established. In this case, the time on the control unit is not taken into account. Check this FAQ: No connection to PLC after WinCC Panel Images V17 Update 6 Regards, Towome
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This contribution was helpful to 1 thankful Users eem28

2/25/2025 8:10 AM	Rate (0)
eem28 Joined: 1/7/2025 Last visit: 11/5/2025 Posts: 16 Rating: (0)	Towome Hi, Perhaps this is the reason: For an HMI with firmware V17.0.0.6 to be able to establish a connection to a controller with SSL/TLS encryption, the date and time of the HMI must be within the validity period of the SSL/TLS certificate of the controller. If the date and time on the HMI are up to date, a connection to the controller should be established. In this case, the time on the control unit is not taken into account. Check this FAQ: No connection to PLC after WinCC Panel Images V17 Update 6 Regards, Towome No, the clock on the hmi is not up to date. I did not connect and check if the clock on the plc is up to date (because it is far away) but what I do know is that when the user manually sets the hmi clock to the current time, it works without any problems for a certain period of time. When the machine is turned off for 2 weeks. The hmi clock and date are corrupted. Edit : hmi version 19.0.0.0 unified basic
	Last edited by: eem28 at: 02/25/2025 08:35:50
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2/25/2025 10:25 AM	Rate (0)
Wizard Diamond Member Joined: 4/24/2006 Last visit: 1/9/2026 Posts: 9104 Rating: (1202)	Hello, The date and time of you panel are backup for about 6 weeks. Perhaps the Capacitor is not completely loaded How long is panel powered up? Best regards, Wizard

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2/26/2025 6:11 AM	Rate (0)
eem28 Joined: 1/7/2025 Last visit: 11/5/2025 Posts: 16 Rating: (0)	Wizard Hello, The date and time of you panel are backup for about 6 weeks. Perhaps the Capacitor is not completely loaded How long is panel powered up? Best regards, Wizard Hello, Maybe it was open for a few hours. I said it according to customer feedback, but they are not clear. I don't know. (What's supposed to happen?) It was closed for maybe 6 weeks. So there is a charging time of 6 weeks. Then, do you think the solution is PLC-->HMI clock synchronization? So how do I do it? Thank you
	Last edited by: eem28 at: 02/26/2025 06:11:26
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2/26/2025 6:22 AM	Rate (0)
Hati Platinum Member Joined: 9/21/2012 Last visit: 1/11/2026 Posts: 4846 Rating: (512)	Set the PLC to be NTP server and the HMI to sync with that.

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2/26/2025 8:13 AM	Rate (0)
Wizard Diamond Member Joined: 4/24/2006 Last visit: 1/9/2026 Posts: 9104 Rating: (1202)	Hello, When the capacitor is not loaded completely, the HMI loose the date and time When the capacitor is full, the HMI will hold his date and time for 6 weeks. To load the capacitor, the panel should be long enough powered on. (it will not be 6 weeks to load ) The synchronization between CPU and HMI, only take place when there is a connection between both. (When HMI has lost date and time, there will be no connection ) It might help to Synchronize the HMI panel using a NTP server, after that you can synchronize the date and time, HMI master and CPU slave Best regards, Wizard

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