Hi everyone, I am currently trying to add a similar udt from TIA Portal to ignition, and although i followed the documentation, there was no indication of how to add structs inside the udt from an ignition prespective, does the dataset type mean "struct"? and how can i add the two structs "cmd" and …

So for your parameter, for the tag you'll want everything up to ".....Cv-001" including the quotes. In your UDT for the start pb member, youll want {DeviceName}."cmd"."bStartPB". Then, the path will be formed to include the value in your Parameter DeviceName + the remaining part from the UDT defin…

Yes, i changed to memory tags, i don't know which is better, derived or memo, but i am still unsure of how to make the connection between local ignition udts and the actual plc udts, gotta dive in a little bit deeper in your post!, sucks being a newbie lol

UDTs in general are useful because they can be parameterized. You're going to end up using these parameters to device the OPC Item Path of the "source" OPC tags that are described in this strategy. Our support guys can probably help you out with this if you get stuck.

So basically, i have created the udts in ignition and i don't quite understand the "OPC item path" part. [image]

Usually, in the UDT, you create a parameter that defines the path to the root of the UDT in your plc. Lets call that parameter tagpath. Say your PLC tag address architecture is something like this: MyPLCUDT.HMIStartPB MyPLCUDT.HMIStopPB So in the Ignition UDT youll create members as an example: …

Thank you for the instruction, i have followed the steps, here is what i got in ignition : [image] This is how data is structured in the PLC : [image] Now, when i try to make an instance of the udt in igntion, i managed to the enter in tagpath parameter, the full text OPC path and still got an …

I would avoid parameter names like "tagpath" to be honest, as it clashes with pre-existing nomenclature and it isn't very explicit in what it's value is supposed to be. For something like a parameter for a UDT name in a PLC, I have used "DeviceName", although I've since regretted not associating it …

Also, it appears your parameter is declared as an int. Would be a string in the ignition udt.

Thank you for your reply, i have corrected the udt in PLC, and removed the param tagpath as shown below : [image] However, in ignition this is how i created the udt : [image] Do you mean, i need to create the param in this section here : [image] And if yes, how do i link this param to the roo…

When you create a tag of type UDT, set the parameter DeviceName to point to the PLC OPC path root. If youre unsure what that syntax is, use the tag OPC browser, navigate to that tag and temporarily bring it into your tag database. Then open one of the tags and copy the portion of the OPC path that…

Not sure if i pointed the param to the right path here : [image] Same with this path : [image]

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Adding a UDT in Ignition

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