Daylight Savings Time, Do you update all devices?

Sliver

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Feb 2004

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Kingston, Ontario

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• Apr 12, 2006

• #1

To all you plant maintenace guys and gals.

As more and more plant equipment has fault logging and time stamping, how do you deal with Daylight Savings Time?

 

Last edited: Apr 12, 2006

TConnolly

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Salt Lake City

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• Apr 12, 2006

• #2

I leave the PLC clocks alone.
The Windoze HMI clocks - which is where the alarm and data logging occurs - change automatically.

 

elevmike

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Detroit, MI

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• Apr 12, 2006

• #3

It depends on the application. On occasion we use the clock to anticipate traffic demand, so there's code in the program to change the PLC clock to Spring Foward & Fall Back...

 

Rube

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Sep 2003

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Fort Worth, Texas

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• Apr 12, 2006

• #4

I've have it set up on our PM program to capture the current program on each PLC (and update the Time) on the date we go to or from DST. Works well for me--maybe not everyone.

 

CaseyK

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In the cornfields, on the prarie, outside Chi-Town

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• Apr 12, 2006

• #5

Central Standard Time!

Too much railroad herritage in my family.

I was disapointed that when I spent a couple of years at the locomotive plant, that they were on daylight savings time.

regards.....kc (casey, as in one of the Jones boys)

 

S7Guy

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Dayton, Ohio

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• Apr 13, 2006

• #6

I would have to vote none of the above. All of my PLCs are updated with the correct time every five seconds by the main server. In fact, every computer on the network is in synch, which helps a lot if I have to look at time-stamped messages.

I'm not sure how it is with other PLCs, but this is pretty easy to do on the S7 platform.

 

ianingram

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Newcastle

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• Apr 13, 2006

• #7

S7Guy said:

I would have to vote none of the above. All of my PLCs are updated with the correct time every five seconds by the main server. In fact, every computer on the network is in synch...

Click to expand...

I have just received an email at work from the IT people apologizing for some confusion caused by the server changing its daylight savings time a week early....

[The change back to normal time in parts of Oz was delayed to fit in with the Commonwealth Games..]

 

Shilo

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Mar 2006

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Georgia

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• Apr 13, 2006

• #8

We change so that the production logs are correct. The operators start crying when their production is credited to a different shift.