Is it possible to write to elements in a OPC Array? I think I tried this, when Ignition 7.9.0 was released, and I believe it worked (correct me if I’m wrong). I’m currently just trying to write to a “test” array defined in Kepware OPC server, but I’m only getting the following error message: [ima…

Yeah, I just had problems with that. My OPC UA server is on a CoDeSys 3 PLC (Mine is WAGO, but there are other that use the same thing, like Bedrock) Things that did not work: Dragging the tag from OPC into Ignition: Results in a String that shows the values (if they are simple enough), but does n…

Despite the last minute introduction of an array tag type, I think the best thing to do for now is pretend it doesn’t exist and address elements of an array directly just as was required in the past. Arrays will get a first class treatment in the next major release.

That is a nice solution, Caleb. Unfortunately I wasn’t able to get that to work (or, I was misunderstanding the solution…very possible!:grin:). I’d like to expand on your solution and see if this approach is of assistance to anybody: In the PLC, build a DUT Structure of the data type(s) that you…

Referring the array elements one by one ends up generating a lot of write commands. At least, this is what I'm seeing working with the Modbus KEP OPC Server. If I build a tags list for the OPC write values command, the server process them one by one. If I use the OPC write value command and the righ…

What version are you using @gkawaguchi ? Using a list for the write works in 7.9.3, at least for an array of Int16 values.

7.8.3 Are you sure it works? With the KEP server? I don’t have this issue with the Ignition Modbus driver because I can’t use arays with it anyway. But lists and the writeValues, referring tags individually, works fine. The driver is smart enough to put it all together. The problem with KEP is tha…

I don’t know if it works with KEPServer, I tested with something else. But the “improved” array support we currently have wasn’t implemented until 7.9. The “first-class” support I mentioned earlier in this thread is for 8.0.

I'm trying 7.9 now. The array class is still unreliable. I think there's a conflict of names and classes. from array import array lstArray = array('i', [1,2,3,4,5]) print lstArray array('i', [1, 2, ... lstQValues = system.opc.readValue('KepServer', 'ns=2;s=Channel.Device.DataArray') print l…

Our UA client implementation is taking care of coercing values to the right type before writing, if possible. I think feeling uneasy about that is actually the right intuition to have, but unfortunately it’s just not possible to create all the UA datatypes from scripting. The array class is part of…

I’ll give it a try. I have to accept that you know more about how the client works than I do. Besides, if it’s going through coercion either way, it doesn’t make any difference to use the right type array… I’m still confused with the Jython implementation. But it’s something for another post. Just…

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Ignition 7.9.2 - Writing to OPC Array

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