Slow HMI response time

[Nogmor]

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

[R.Mozes]

Dear Sir,

 

Thank you for your feedback!

Please send your project for examination to support@unitronics.com .

also, few instructions how to simulate the problem and your O/S version.

 

Thanks..

[Nogmor]

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

[Nogmor]

Problem Solved.

 

Thanks for the help!

 

And for future reference - always check every item on the HMI is properly defined in each parameter.

[Flex727]

Inquiring minds want to know - what was the cause of the problem?

[Nogmor]

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.