System tags not writing to DB on tag value change

Ignition
1

Hi, I'm inserting data to a DB on tag value changed. The tag below isn't writing to the DB and shows as Null.
UserName = system.tag.readBlocking("[System]Client/User/Username")[0].value

All other tags (from default tag provider) are writing to the DB correctly, except for this one.

2

The correct syntax would be something like:

UserName = system.tag.readBlocking(["[System]Client/User/Username"])[0].value

edit: nevermind, there's a special exception that allows the scalar input value to work in addition to the list. It's what Paul asked about the scope.

3

Be more specific about where you're calling this from. As in, literally on a tag's event script valueChanged? Because you can't read the client user name from that scope - you're in the wrong place.

1 Like
4

Yes, I'm on the tag's event script value changed. That would explain. Thanks. Would that need to be done on the Client Event Scripts with Tag Change?

1 Like
5

Yes, that's the easiest way to get that info. Note that you won't be able to attest, for instance, that the tag was modified by the user in question - that event will fire once per open client whenever the specified tag(s) change.