Hi All, I was reviewing the thread “DNP3 Event buffer backfill” and couldn’t figure out what state Ignition’s support for DNP3 events is in as of v8.0. If I lose connectivity to some number of my DNP3 outstations and they buffer, say, 40k events each with timestamps, will all of the data find its w…

We did some work on this in 8.0.13. All your tags from DNP3 tags need to be in a dedicated tag group with the Queue Size OPC UA property set to something large enough to accommodate the number of events the device might buffer per tag. (so… don’t set this to 40k, set this to 40k divided by the numb…

Ah, fantastic, thanks mate! Sounds like I’ve come across Ignition at just the right time for what I need to make happen on my sites. Just to round out the discussion, do you think you could run me through what’s currently missing from the ignition DNP3 driver so that I can plan around it? I saw som…

I think there may have been an issue where the DNP3 driver on the backup in a redundant pair would also make a connection but that should be fixed now. Other limitations people have run into… it’s DNP3 over TCP/IP only, no secure auth, no dual endpoint or reverse connect or whatever you might know …

Ah right, so when Ignition is actively polling, it’s doing something closer to what the modbus driver would be doing and just reading the value? Fortunately, my device supports sending unsolicited messages. Do I need to disable/enable anything or change anything else in the Tag Group to take advanta…

You don’t need to change anything else in the tag groups. Unsolicited messaging is configured on the device instance and is just a checkbox you need to enable.

Sorry to open this one again! Up until now I’ve been using SQL Bridge Historical Groups to store data rather than the standard tag history feature. The reason I’ve been doing this is because I need my data stored in named tables rather than in the time series DB format used by Ignition (even though…

[image] BenKearney: can I expect my buffered tags to end up in the database after communications are re-established? Unless it has been added in the past month or so, No. Not for SQL Bridge.

The documentation for the SQL Bridge suggests that events are received asynchronously and that events received before the next execution will be used at the time of the next execution. Kevin described buffering as being introduced recently, so it sounds like the transaction group would receive multi…

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DNP3 event buffering in 8.0

Ignition

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