Hello, I am new to Ignition and to OPC UA so I have a bit of a n00b-ish question. I have read that OPC UA performance can be optimized by subscribing to arrays and structs rather than individual tags. I’ve created some arrays in my PLC (I’m using an S7-1500 with its built-in OPC UA Server, firmwa…

You can take advantage of reading whole structs in OPC UA servers as of Ignition 7.9.12 and 8.0.0. When you bring the tag in you’ll notice Ignition presents a JSON value. The strategy here is a little involved but it works. For each of the UDTs you’ll be subscribing to in the PLC you make a corres…

[image] Kevin.Herron: Ideally y You want to avoid this kind of scenario where both the PLC and an external system can be writing to the same tag FIFY. It really is an unfixable race. Just don't do it.

@Kevin.Herron is the escape flag: wrapper.java.additional.2=-Dignition.tags.processbackfill=true still functioning after 8.1.3? I opened a ticket with support regarding this issue and they pointed me towards this post, which fixed the issue in 8.1.3 but testing on gateways at 8.1.4 and 8.1.7 I am …

I’m not sure that option and the scenario you described have anything to do with each other. Can you start from the beginning with the problem you’re seeing, preferably in a new topic?

Hi , i have installed version 8.1.7 and problem writing 2 tags at the same time seem have old problem again... I have this setting of tagGroup: [2021-07-07 17_24_50-Tag Group Editor] I turning the logger tags.execution.actors.opc.writemanager to DEBUG and this is the output: [2021-07-07 17_21…

UPDATE: if i write two tags directly , not passed from template custom property: paths = ["[default]ZONA_100/DVC/ARR_1/C_Mon", "[default]ZONA_100/DVC/ARR_1/C_Moff"] values = [1,0] system.tag.writeBlocking(paths, values) It work............... Why? Thanks

I am struggling to get my OPC tags to work with my UDT in the PLC I have an S7-1200 connected using the OPC server in the PLC. I have watched the Inductive University video on connecting UDT using the parameter function but my OPC item path in the tag is totally different. I have also read about …

Drag and drop works, you’re not doing anything wrong really, but when using this “Service Interface” mechanism in the S7-1200 we’re not able to read structures. [image] OPC connections between Ignition and Siemens PLC Ignition Another thing I will mention, since I missed …

Ok, I have it working now. I used the parameter function and added an offset to the UDT I created in Ignition. Now I create a new tag and change the offset value to read the correct tag in the S7-1200 Thanks Kevin for your quick response [Parameter]

We are using Ignition 7.9.18 with Ignition's OPC-UA server and Rockwell ControlLogix 5580/5570 PLCs, just wondering if this would be achievable for us or whether it only applies to Siemens PLCs? If so, can you elaborate on how to get an OPC tag to present as a JSON string when reading a UDT? If not,…

Same strategy applies to any OPC UA server using structured datatypes. If you can't just browse to the Variable Node with the structure type, drag it in, and have it show up as a Dictionary/JSON then the server may not support the (now legacy) DataType Dictionary mechanism for exposing datatype def…

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OPC UA struct data type?

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