Contrologix V16 Wallclock Issue

curlyandshemp · Feb 28, 2007

In version 16 of Clgx, I have created an AOI to generate a timestamp. I have noticed that the time reported always appears to be 5 hours ahead of the PLC clock. Then it hit me, I have my time zone set to EST, which is 5 hours behind GMT. It appears the GSV for WALLCLOCK reports back the CPU time plus how many hours away GMT is .

Is this a new feature, or am I misunderstanding this instruction. In V15, the WALLCLOCK always reported back the CPU time.

Ian

time reported from GSV for WALLCLOCK reports CPU time + #hours away from GMT

TConnolly · Feb 28, 2007

Its a new feature - advantage: automattic DST.

curlyandshemp · Feb 28, 2007

Alaric said:
Its a new feature - advantage: automattic DST.

Don't follow what you mean, but I have noticed that if DST is checked, the PLC clock will advance 1 hour.

But the issue is that there appears to be a relation between the Time Zone and the time reported by the WALLCLOCK CLASS in the GSV instruction.

Ian

TConnolly · Feb 28, 2007

Yea, setting Daylight Savings Time has a nasty habit of doing that.

Must be a bug.... or something.

Operaghost · Mar 1, 2007

I assume you are using the Date/Time attribute. Try the LocalDateTime instead. It works just fine.

The additional features added to the WallClock means some things are a little different now. Read through the help on the WallClock object and you will see the new attributes.

Now you have a Universal Time that is independent of the time zone and a local time that can use DST or not. You can even manually specify the DST adjustment.

OG

curlyandshemp · Mar 1, 2007

Operaghost said:
I assume you are using the Date/Time attribute. Try the LocalDateTime instead. It works just fine.

The additional features added to the WallClock means some things are a little different now. Read through the help on the WallClock object and you will see the new attributes.

Now you have a Universal Time that is independent of the time zone and a local time that can use DST or not. You can even manually specify the DST adjustment.

OG

Okay, thanks I will give that a try

Contr_Conn · Mar 1, 2007

in ver 16 DST is not automatic or based on your time zone like Windows does. You have to do it manually.

Contr_Conn · Mar 1, 2007

Here is how Walltime clock works in ver 16:

- controller always uses GMT time, when you read DateTime , you will see GMT time
- If you specify your time zone (example GMT-5), controller properties will display WTC-5 time, actually doing math for display
- If you set clock from PC, then software will convert time to GMT and write it to the controller

- Daylight savings is not automatic, by checking it you actuall add 1 hour to the display, nothing else. No dates set for change, your application will have to do it.

So actual time is DateTime +TimeZoneString + DSTAdjustment
See GSV help for all new WTC objects

TConnolly · Mar 1, 2007

Contr_Conn said:
- Daylight savings is not automatic, by checking it you actuall add 1 hour to the display, nothing else. No dates set for change, your application will have to do it.

As in the display in RSLogix5000 only?

I thought checking it added an hour to value that the GSV instruction returned. Thats good to know.

Contr_Conn · Mar 1, 2007

DateTime always returns GMT

LocalDateTime and RSlogix5000 reflect DST and TimeZone offset

curlyandshemp · Mar 1, 2007

Contr_Conn said:
DateTime always returns GMT

LocalDateTime and RSlogix5000 reflect DST and TimeZone offset

Changed Attribute Name from DateTime to LocalDateTime and my Timestamp AOI now returns the current time zone time/date

Thanks
Ian

Contrologix V16 Wallclock Issue

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