Nogmor

Thanks for the reply, I am not looking for an actual pH simulator, I figured I could simply program one in the PLC in Ladder, no? Assining an MI to a virtual pH value, and incrementing/decrementing according to I/O which I activate. What I'm looking for, is simulating a pH sensor in the PLC itself via ladder-logic, and what I have up to now is not the best of solutions, but it's going O.K. I just need to make sure it resembels actual pH sensors.. Thanks for your help!

Hi Memphis! I am right now working on such an exact process! I am in need of a pH Sensor simulator for the PLC which should respond to addition of acid while water is being pumped through a pipe. I have used a method of simply adding acid when the valve is open (and the pH is virtually lowered) and when it is off, the pH automatically rises (since only water is being pumped). I would love to see what your final solution is on this issue as it would help me as well. Thanks!

Hi and thanks! I am currently using VisiLogic 9.4.0 and the file you created (is apparently) from the newer 9.5.0. I am having some difficulties using the 9.5.0 version, any chance for a 9.4.0 version of the file? Or just a general explenation on how you achieved the 3 state switch? (Maybe multiple coils?) Thanks! Mori

Hi, the visilogic has a nice Auto/Off/Manual switch images but - how do I use them? I need a 3 state switch, but the only options i could find are the "range of images" and the 2 state bit-switch. Thanks, Mori

Well, it seemed that I had a thermometer graph which did not have its Minimum and Maximum values defined at all (not 0 but blank fields) which caused the HMI to keep redrawing itself without ceasing that caused the slow refresh time.

Problem Solved. Thanks for the help! And for future reference - always check every item on the HMI is properly defined in each parameter.

Sent. Also, when going over it, I'd love some feedback on how to improve some of the logic which I'm sure is basic. Thanks. Mori

Hi! First of all, I would like to say I love your controllers! They are excellent and make work so much more easier and automated. Second, I seem to have stumbled on a very peculier state in which an HMI screen is simply responding very slow (Slow frame rate?) the scan time is normal: 2 - 4 ms and for some reason only a single HMI screen in the multitude of screens is responding slow. Controller\PC Setup: V1040 OPLC with V200-18-E3/4XB Snap-In and two expansion units: IO-AO6X and IO-DI16. Visilogic 9.4.0 (Having trouble converting to 9.5.0... - for next time) running on Intel Pentium 4, 3.00GHz under Windows 7, 32-bit with 4 GB ram. The Visilogic itself is a bit slow at times, but I would hardly believe this to have an affect on the PLC itself. I have about 8 HMI screens on a program, with 8 ladders for each screen. I designed to program to run more than one ladder at the same time, but just to figure this out, I cancled all of them and kept the single problematic HMI screen+ladder running, and still the HMI screen is slow to respond (button pressing, switchs change bitmaps etc). Even disabling the ladder and simply staying on the HMI is not helpful - even when no ladder logic is being used (accepting voltage) the respons time of the HMI is still slow - and this is just one single screen. I have found an SI which I believe is the frame rate or a very good identifier of it, since it only changes to a very low number when i am displaying this HMI. SI 44 - Although it is undocumented anywhere I looked, apparently, changes between 256 and 20 whenever I display the problematic HMI. Every other HMI screen has SI 44 at 256, but when I display the problematic HMI, SI 44 changes rapidly from 256 to 20-21. Hope it helps you figure it out. Thanks alot for your help! Mori