Modicon M340 PLC Clock and Citect

[jfritz8]

Hi all,


I'm running into an issue with a Modicon M340 PLC Clock and daylight savings time. I found an old thread that wrote out specific code on how to set the clock here: http://www.plctalk.com/qanda/showthread.php?t=81589&highlight=Modicon+M340+Clock


I tried implementing the code in the M340, but when I set the %S50 to 1 it does not allow me to write into the integers I created.


Has anyone ever done this before with Citect and M340?

 

[Lare]

If you use simulator, then yours programmin PC clock is taked to simulated time to system words.


You need real PLC for testing clock system words.

 

[jfritz8]

If you use simulator, then yours programmin PC clock is taked to simulated time to system words.


You need real PLC for testing clock system words.

Thanks for the reply Lare,

I was using a PLC that is in the field so it was not a simulator. For some reason when we set that bit all the fields went to 0 and we were not able to type anything in to change. I made sure the PLC clock was set from the computer before we started so that wasn’t an issue.

 

[Lare]

Do you have any logic code for clocks setting?


From animation table you should be able set %s50 and animate date and time system words.


If you set %50, system words should have same values than just before setting bit.
You can adjust system words and when you reset bit %s50 new time is readed to CPU.
system words are only on BCD-format.