Set one tag value to another tag's value on valueChanged event

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In a script, you can not directly address a value.

This: '[.]Online' is just a string.

Technically, system.tag.read() will work but it's deprecated.

There are two other functions you can use to read tag values depending on if you need it to block or not.

system.tag.readBlocking()
system.tag.readAsync()

And they return a List of qualifiedValues so you must index into them as such and access the value property.

This post will give you a quick history lesson on this, if you're interested.

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