EZ Automation touchscreen update speed vs AB

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Mike Zobrest's Avatar (by Gravatar)Mike Zobrest posted on
May 31, 2007, 3:39 pm
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We have just finished a large project using an EZ automation
touchscreen and we found that the update speed of the screens was very
poor, in the neighborhood of 8 seconds on a switch to a new screen.
Once the screen was displayed and synch'ed the update speed was
normal.  The time was even greater before changing the addresses of
the alarms so that they were sequential.  The number of tags was
around 1100 and we used universal ethernet communications at 10 mb.
My question is, would using an AB panelview provide much better
performance or is the communications of the PLC port going to be a
bottleneck anyway?  For this project we used an SLC 5/05, but in the
past we have had similar problems with SLC 5/03's using CMore or
EZAuto HMI's using the DH485 protocol.


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Cameron Dorrough's Avatar (by Gravatar)Cameron Dorrough posted on
May 31, 2007, 5:55 pm
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Re: EZ Automation touchscreen update speed vs AB




Hi Mike - is a Panelview going to be quicker? probably not.. for such long
updates, a configuration issue is most likely.

The first question is:  Do you have anything else on the ethernet network?

Cameron:-)



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Mike Zobrest's Avatar (by Gravatar)Mike Zobrest posted on
June 1, 2007, 6:50 am
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Re: EZ Automation touchscreen update speed vs AB



I removed everything from the network with no change.
I am comfortable this is not a network issue or a configuration issue,
I worked at length with the tech support people on it.
The delay to synch the screens was in the 16 second range before I
made the alarm addresses sequential.
The tech support said that they have heard this type of complaint
before.
I was curious if anyone had ever run two similar project on an SLC
with one using a Panelview and another using a CMore or  EZAutomation
touchscreen.  I can't believe an 8 second delay is acceptable to AB,
but I don't (didn't, the equipment shipped) have $4k and the
programming hours available to get a Panelview in and play with it.


Steve Cothran's Avatar (by Gravatar)Steve Cothran posted on
June 1, 2007, 4:21 pm
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Re: EZ Automation touchscreen update speed vs AB



I think I would whittle down the problem, say transfer 100 or so tags
and see if that takes an inordinate amount of time. You could have a
ground loop/noise problem that is causing bad packets and retries,
especially if the PLC and Panel have separate power sources. See if
there is any differential voltage (AC or DC) between the SG of the PLC
and SG of the panel with the cable unplugged. Some of
AutomationDirect's products are also sensitive to a floating control
voltage (One side of control xfmr not grounded), although I can't tell
you why.


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