Thanks for replying Darren,
I wonder if you checked my message posted on 07-06-2009 12:43 PM. where the "not" and "not not" contacts display same program on ladder editor. Will you please advise?
Made a mistake should be color instead of program. Both mentioned contacts show same color either green or red simultaneously.
It might be a timing issue, as the LEDs update at a constant rate of 100ms. If your data is being updated faster, the LEDs may not register the value changes in time. Also note that the LEDs are simply showing the value of the variable configured for that contact or coil...the LEDs don't reflect the actual logic of the contact/coil in that position. Now that I think about it, I'm guessing this is the reason you're seeing the behavior you describe.
Darren Nattinger, CLA,
Yes Darren, it seems to me that only the "Not Contacts" are never getting updated to reflect correct color or as you say they are not reflecting "the actual logic of the contac/coil in that position". These contacts are always showing same color as the "Not Negated Contacts" Any possibilities this issue might get corrected in the future?
Thanks for your reply
I just wanted to throw in one of my customer's feedback. I am an alliance member and my customer is a PLC guy. He doesn't like LabVIEW and is very hesitant to learn it. He is very comfortable programming PLC's I am quoting him a project using the Ladder diagram editor. He is VERY excited about this. I see this a lot with PLC guys not wanting to make the jump into LabVIEW. I think this is a good way to get them introduced to the LabVIEW enviornment with a language they are familar with. I would agree with an earlier poster that to penetrate the industrial control market having a ladder diagram editor would be a good idea. It is a very easy sell.
As someone who is a traditional PLC Guy in the industrial field, LabVIEW has a whole lot going for it, but to 'break' into the industrial field i am not sure a ladder diagram editor is going to really sway too many people. One of the proboems NI Has is competing with the $100 Programmable Bricks with the free (or very nearly) software from the likes of automation direct, LG and well...that just doesnt seem to be the direction NI are headed. Perhaps if a Labview release Front end with all the IEC61131-3 languages being supported you might get a few more, but price point is always going to be a major factor.
For my money NI's 'in' to my world is the fact the Hardware is Way Way Way better than anything in the PLC Field and as a 'PLC Guy' the hardest part of my learning curve was (and is) the flexability of Labview compared to PLC programming Platforms, Sure i can do heaps more, but where do i start...And also the realisation that it is a 'Real' Programming language (you know like c/c++, ie.the hard ones) and not a simple one like RSLogix was a bit of a brown undies moment.
I guess that might be why all those research scientists seem to use it for Robotics, and those crazy RF boys use it for whatever the **** it is they do, but for telling conveyor to start and stop, well, even i can do that. I am just not sure i need a $15000 software suite in order to do it. hmmmm now if someone could make a labview editor for my OT thoughts that would be sweet.