Bad_ReadOnly when updating a UDT tag Value

[aamrc]

Hi,

When I try to edit some tag values that sit under a UDT within Designer I get an error Bad_ReadOnly popup. I’m puzzled what I’m doing wrong as some tags that sit under the same Edge Nodes but are not under a UDT can be edited (i.e. I can see Ignition issuing a DCMD message over MQTT).

I’m using Ignition + MQTT Engine. I create tags with the Node-RED Sparkplug client.

What can cause this error?
I’m running Ignition 8.1.

Art

[aamrc]

To add to this I’m able to system.tag.copy and the Read Only field is set to false by default.

I’ve tried 2 commands:
system.tag.writeBlocking([cmd_resp_path], ["Command Rejected. Permission Error"], 5000)
system.tag.write(cmd_name_path, "Command Rejected. Original Command")

The Legacy system.tag.write is the only one that gives an error: