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Clock synchronisation

Created by: kovy at: 1/21/2013 12:39 PM (11 Replies)

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1/21/2013 12:39 PM	Rate (0)
kovy Posts: 4 Rating: (0)	Hi there! I have one question. In our company we have a lot of devices added to project in Digsi4 program (about 300 devices) and we have a lot of difficulties syncronising them with a clock. We started to build in GPS clocks, but still there devices dont have same clock. There are still some deviations. I know, that you can send time information to single device at a time. I want to know if there is a way to send time information to all devices simultaniously? Miha
kovy Posts: 4 Rating: (0)
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1/21/2013 1:24 PM	Rate (0)
Silent Bob Posts: 836 Rating: (100)	Hi, as far as I know this is a product of Siemens Energy which actually is another sector of Siemens.Youpropably won't get so much help here because this forum is focused on products of Siemens Industry. Check out this thread where I posted contact informations of Siemens Energy, maybe they can help you.
Silent Bob Posts: 836 Rating: (100)
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1/21/2013 1:35 PM	Rate (0)
kovy Posts: 4 Rating: (0)	i know that, but still i asked here on forum if maybe someone knows if this can actually be done thanks anyway
kovy Posts: 4 Rating: (0)
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1/21/2013 1:46 PM	Rate (0)
Silent Bob Posts: 836 Rating: (100)	Ah ok... at least its worth the try ;-) good luck
Silent Bob Posts: 836 Rating: (100)
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1/22/2013 9:33 AM	Rate (0)
Mike J Platinum Expert Joined: 10/9/2007 Last visit: 9/12/2025 Posts: 1282 Rating: (116)	Hi is the GPS connected directly to Siprotec using the port A? which communication protocol do you have? where did you see the time deviation? Mike
	Energy Automation products: Sicam, Siprotec, Digsi
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1/22/2013 10:26 AM	Rate (0)
kovy Posts: 4 Rating: (0)	Hi! its not the problem with GPS modules. devices are connected corectly to GPS module and they are getting correct time, but the problem is, that not all devices can be connected to GPS modules, because or the signal is weak or we cannot mount GPS antena there. So actually 60% devices are connected to GPS modules and are having correct time. So the problem are other 40% of devices(about 200 devices). If we start correcting time it will take a lot of our time and work and still we wont be sure if we set clock on all devices correctly. So i would like to know if there is a way to send time information to all devices at the same time using digsi 4 program?
kovy Posts: 4 Rating: (0)
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1/22/2013 11:07 AM	Rate (0)
Mike J Platinum Expert Joined: 10/9/2007 Last visit: 9/12/2025 Posts: 1282 Rating: (116)	Hi Now it is clear. From Digsi you can only set time for one device at a time. But this is time setting, not time synchronisation. A device considers its clock "synchronous" only when connected to a clock sorce. There are some options: - install more GPS. Siprotec works with milisecond, so any time difference between GPS smaller than miliseconds - and all I know are - won't be a problem. - synchronize Siprotecs using binary input. Some GPS systems can synchronize devices using a binary output. - synchronize using the automation system. Which communication protocol do the Siprotecs have? Mike
	Energy Automation products: Sicam, Siprotec, Digsi
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1/22/2013 11:19 AM	Rate (0)
kovy Posts: 4 Rating: (0)	yes ttime settings would be better ok then i got the answer, only one device at a time. then we will have to figure something else. we are installing gps modules but like i said, we cannot instal them everywhere. we are using IEC61850.
kovy Posts: 4 Rating: (0)
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1/22/2013 12:48 PM	Rate (0)
Mike J Platinum Expert Joined: 10/9/2007 Last visit: 9/12/2025 Posts: 1282 Rating: (116)	hi if you are using IEC61850, the answer is simple: SNTP. If your actual GPS doesn't have a NTP Server, you can buy one. They can synchronize thousands of devices - pay attention to the maximal number of request per second. If your automation system is a Sicam PAS and it is already synchronized by your GPS, Sicam also has a NTP Server and can be used to synchronize all your devices. Mike
	Energy Automation products: Sicam, Siprotec, Digsi
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This contribution was helpful to 1 thankful Users Imran24

1/22/2013 12:59 PM	Rate (0)
Mike J Platinum Expert Joined: 10/9/2007 Last visit: 9/12/2025 Posts: 1282 Rating: (116)	Hi this is one example of NTP Server. http://www.meinbergglobal.com/english/products/compact-ntp-server.htm It also has a SNMP Server, so you can monitor the GPS and have alarms in case of problems, for example: problems with antenna, number of satellites and so on. Mike
	Last edited by: Mike J at: 1/22/2013 1:50 PM Energy Automation products: Sicam, Siprotec, Digsi
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This contribution was helpful to 1 thankful Users Imran24

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