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Data from PLC is skipping in IWS application.

Admin
Hello,
I have the issue of refreshing the data coming from PLC. The PLC is refreshing data at approx. 30ms. The data displayed on application seems to be skipping some values. I guess it is the scanning issue. Where can I see the scan time of IWS application and can it be modified? if not, what may be the other possible issues to look for?
I am using IWS 8.0 and communicating through OMETH driver.

  • Greetings,
    I'm running IWS 7.0 and used the KOYO driver to communicate with my PLCs to read thermocouple and 4-20mA data and to date, I have never experienced your symptom. My PLCs scan time is typically less than 12ms. I would start by monitoring the suspect values on your PLC Data View table. If the values are good, try monitoring your network data to see if there're any hiccups , i.e. crashes that may introduce a delay of some sort.

    Hope this helps
  • Ive seen this before, Basically your Plc is able to Refresh Data Much Faster Than indusoft, I use Automation Direct Click and Pac 2000/3000 PLCS. and My Plcs scan times are 1-5ms. So Indusoft doesn't recognize every Single Flicker in the data and it kind of jumps around. I fix this by either slowing the data into the PLC with logic, or my favorite way is to avg. the data out and display the AVG. on indusoft. That Makes it flicker less.
  • I do not know about the OMETH driver but with the Siemens SIETH driver using the Standard Driver Sheet is much faster than the using the Main Driver Sheet.

    Also look at the OMETH.ini file. There maybe are some tricks in there to speed things up like in the SIETH driver.

    With 1400 tags my update is around a second. More tags you have the slower it is. Having lots of small driver sheets is faster than one large one. I have 70 driver sheets.