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PC as SNTP time server for other devices in the local network

315-2DP 10209 8
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  • #1 17084792
    315-2DP
    Level 17  
    Hello!

    I have an application in which there is one PC and several automation devices in the same local network. These devices need to synchronize their time with this PC and the only option they have is to synchronize with the SNTP server. In addition, there is also a requirement that none of these devices can be connected to the Internet. The network and its devices must be isolated from it.

    Can I install a program on this PC that would emulate the SNTP server and allow the devices to synchronize with the local PC time?
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    #2 17085029
    Borygo123
    Level 28  
    And what will you sync your local PC with? Computer clocks are not very accurate and after a few days you will have a time difference. Such a computer, if it cannot synchronize via the Internet, must have a clock connected with a GPS antenna. It can be a device connected to an industrial network and the synchronization will not require computer operation.
    Generally, if you want to do it on a PC, you just need to change a few settings (in Win7) and the PC will act as a time server (look for "windows 7 as a time server"), but as I wrote before, without being connected to the Internet, the time will spread very quickly.
  • #3 17085824
    315-2DP
    Level 17  
    Borygo123 wrote:
    And what will you sync your local PC with? Computer clocks are not very accurate and after a few days you will have a time difference. Such a computer, if it cannot synchronize via the Internet, must have a clock connected with a GPS antenna. It can be a device connected to an industrial network and the synchronization will not require computer operation.
    Generally, if you want to do it on a PC, you just need to change a few settings (in Win7) and the PC will act as a time server (look for "windows 7 as a time server"), but as I wrote before, without being connected to the Internet, the time will spread very quickly.


    I know they will go away ;-) Here it is more important that these devices have the same time as the PC, not that they have a perfectly up-to-date time.
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  • #4 17085841
    Borygo123
    Level 28  
    Well then you can go ahead and apply what I gave (I assume the W7 system, I don't know what you have) Link
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  • #5 17085864
    315-2DP
    Level 17  
    Borygo123 wrote:
    Well then you can go ahead and apply what I gave (I assume the W7 system, I don't know what you have) Link


    Thanks, but now I think that an external SNTP server synchronized with GPS would also be a good solution. It is true that, as I wrote, it is important that the devices have the same time as the PC, not that it is up-to-date, but since you can have both ;-) Do you know any inexpensive device mounted on the TS-35?

    PS I have a W10.
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  • #8 17648571
    .:Marcin:.
    Level 13  
    Hi
    I have this pico. Dahua recorders synchronize nicely over the server IP.
    I have a problem with windwomen. Crashes an error. Computers can't access the internet and hence the pico idea.
    Anyone suggest something?
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Topic summary

The discussion revolves around setting up a PC as an SNTP time server for automation devices within a local network that is isolated from the Internet. The initial concern is the accuracy of the PC's clock without Internet synchronization, with suggestions to use a GPS antenna for better timekeeping. Users discuss configuring Windows 7 and Windows 10 to act as time servers, emphasizing the importance of synchronizing the devices to the PC's time rather than having an up-to-date time. Recommendations include using external SNTP servers like the Elproma NTS-5000 and NTS-pico, which can synchronize with GPS and are suitable for DIN rail mounting. Some users report successful synchronization with Dahua recorders but encounter issues with specific software errors when the devices cannot access the Internet.
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