help date stamping on pvp and compactlogix

stu · Aug 11, 2011

hi guys
i have a little bit of a problem, i need to get a date stamp once a setting has changed, i have 9 figures that i would like to enter the date into a string display on the hmi (pvp)if any of the 9 figures are changed?? but i dont know how can anyone help , i am using a compactlogix plc and a pvp 700?

a sample of the code may help to get it in my head thanks stu

robbo · Aug 11, 2011

Not exactly what your doing but I used to work where we had an operator that would change servo settings 1/2 hour before the end of his shift so the machine ran badly for the other shifts.
I did some code in the background to test a theory before going fully into logging trends etc.
Write the setting I had into a register and compare it against itself. When its no longer equal, latch a bit that can raise an alarm is how I got by.

stu · Aug 11, 2011

How easy is it to write to a register, I am new to this sort of thing, thanks for your time

robbo · Aug 12, 2011

Do you need any more help than that? A very very basic bare boned solution that needs some extra code but will do for a start

this would need to be done 9 times etc

are you on top of machine edition? for the hmi alarming etc?

stu · Aug 12, 2011

Thanks for that, I will give that a try, it's a great starting point. Could I have the 9 neq intructions in Parallel to the latch instruction or wallclocktime intruction to display a date stamp on a screen , thanks stu

robbo · Aug 12, 2011

All the sate stamping is done automatically in the alarm setup for the HMI program - MAchine edition. When the alarms go off, the alarms are date stamped ont he screen

steveb1475 · Aug 12, 2011

robbo said:
Do you need any more help than that? A very very basic bare boned solution that needs some extra code but will do for a start

this would need to be done 9 times etc

are you on top of machine edition? for the hmi alarming etc?

That isn't ever going to latch, the two values are always going to be the same when evaluated by the neq.

You want a NEQ adjustment test_adjustment MOV adjustment test_adjustment OTL adjustment_1_has_changed

dcooper33 · Aug 13, 2011

http://www.plctalk.net/qanda/showthread.php?t=64885

You may find some helpful information in this thread

EDIT: Robbo's method should work just fine, as long as the rung order is reversed, execute the COP after the alarm bit is latched

robbo · Aug 22, 2011

Yea I didnt test at the time - you are both right - sorry for any confusion there

help date stamping on pvp and compactlogix

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