NA daylight savings time - Codesys v2.3

electro89

Member
Join Date
Mar 2012
Location
Canada
Posts
106
Anyway to set automatic daylight savings time in North America using codesys 2.3?
I have the oscat library which is good for European DST only as far as i'm aware.
If it helps i'm using the wago 750-841 with the 750-640 rtc card.
 
You would generally download the text version of Oscat and then create your own version of the function or function block that you want to change.

I'm not sure which specific functions you are using.

I believe most of the comments in the text are in English.
 
download the TXT version of oscat, it is complete and it helps you to view how tobby wrote it.
And yes you can change it to american.
lets try something, i tried to include the txt version but that does not work
go to oscat.de find the basic text
http://www.oscat.de/downloadmanager/viewdownload/3-oscatbasic/81-oscat-basic-text.html

or email me [email protected]
it is free and open source.

look in the text for below.
i do not know the american dates.
but if you have them, please mail them to him or me as this forum is very big.

hugo will give them in his program.

Equation used TO calculate the beginning OF European Summer TIME:
Sunday (31 - (5*y/4 + 4) mod 7) March at 01.00 UTC
(valid through 2099, courtesy of Robert H. van Gent, EC).

European Summer Time ends (clocks go back) at 01.00 UTC on

* 29 October 2006
* 28 October 2007
* 26 October 2008

Equation used to calculate the end of European Summer Time:
Sunday (31 - (5*y/4 + 1) mod 7) October at 01.00 UTC
(validity AND credits as above).

 
The North American dates are the 2nd sunday of march at 2am (goes ahead to 3am)
and the 1st Sunday of November at 3am (goes down to 2am). I will play with this text for a bit but like i said i'm new at this so we'll see what happens. thanks for your help
 
I don't see how to change this equation to suit north american dst.
Is there a function block where you can trigger an event on the 2nd sunday of march or 1st sunday of november?
 
Ok, so for now I'm just going to let the DST be a couple weeks off.

The problem now is that when daylight savings is triggered, it goes back an hour instead of ahead in my ethernet settings (on the http site and on Wago Ethernet Settings software)
 
Last edited:
Been looking for us version all week.
http://www.webexhibits.org/daylightsaving/i.html
For the United States:
Begin DST: Sunday April (2+6*y-y/4) mod 7+1
End DST: Sunday October (31-(y*5/4+1) mod 7)
Valid for years 1900 to 2006, though DST wasn't adopted until the 1950s-1960s. 2007 and after:
Begin DST: Sunday March 14 - (1 + y*5/4) mod 7
End DST: Sunday November 7 - (1 + y*5/4) mod 7;
European Economic Community:
Begin DST: Sunday March (31 - (5*y/4 + 4) mod 7) at 1h U.T.
End DST: Sunday October (31 - (5*y/4 + 1) mod 7) at 1h U.T.
Since 1996, valid through 2099
(Equations by Wei-Hwa Huang (US), and Robert H. van Gent (EC))
 

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