Client tag change event missing tag changes

Ignition
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1

I am uncertain if this is an issue with tag change events or tag groups, but i am seeing tag change events being missed.

My tag change events have multiple tags that open one popup window. The tag are set to be on for at least 1 second in the PLC. The tags are set to Direct Mode, Data Mode Subscribed, and at a rate of 350ms.

For one of these tags to change the operator has to hit a next button, which sometimes they do very rapidly, even though the PLC is latching those tags on for 1 second some how not all the events are firing and only some of the popups are being shown.

I can provide the change scripts and any other information if anyone here has an idea how to get to the bottom of my issue, thanks!

2

Are these Tag Value Changed events defined on the tags or are these Client Tag Change events (or Gateway Tag Change Events)? How many events do you have configured or how many tags are configured for the one event?

Also, take a look at the status page on the gateway for the device you are reading the tags from. What is your overload factor for the 350ms group? If its anything over 0% then you are not polling as fast as you think you are, and there is delay.

Are there any errors in the client logs? I'm assuming your change scripts are fairly simple, but to be able to rule them out, post an example one here, as preformatted text, see Wiki - how to post code on this forum.

3

The tag change events are Vision Client Tag Events and not defined on the tags themselves.

The status page has the overload at zero, though i have seen it up to 5%.

There are not any errors in the gateway Status tab > Logs, is that what you mean or is there somewhere else i should look?

Here is one of the tag change script:

if newValue.value:
	window = "Admin SP"
	system.nav.openWindow(window)

Edit:
I found the diagnostics tab (i always have the menu bar hidden and hadn't noticed that was there)
I don't see any errors in the logs, though i could have the log level incorrect for something.

I just did some more testing and when i really spam the next button it seems like its preventing all of the tags from being read, is it possible that sending that many tag writes out is swamping the reads?

4

Yes, and tag change events will not be sent from the gateway to Vision clients faster than the project poll rate (default 250ms). If your scripts are tying up the Vision foreground thread, you'll miss more.