Too Many Monitored Items

Ignition
1

Hello!
I have an Omron NJ502 PLC communicating to Ignition Edge using the OPC-UA protocol. There are approximately 2500 tags configured (mix of string, DINT, Real, boolean). About 25% of them are reporting a configuration error. The diagnostic info says Bad_TooManyMonitoredItems: The request could not be processed because there are too many monitored items in the subscription.

I've created several different tag groups with different timing (0.7 sec, 1.3 sec, 1.7 sec) and I've even created tag groups that are leased, so that they only update when on the screen, but this isn't helping. I've used Ignition with many more tags than this, so I think that there is some other problem that I need to increase a limit or threshold somewhere.

Any idea where I can find that and how to do it?

Thank you!

2

The NJ 502 only supports 2000 monitored items across the entire server.

To work around this, you could create a Tag Group for your slowest set of tags and change it to OPC Polled/Read mode. Tags in this group will be read via the OPC UA Read service, periodically, at the group rate, rather than have Monitored Items created.

3

Kevin,

Thank you for the information. I'll investigate your suggestion.

Thank you very much!