I am trying to show a value for voltage on a graph. The tag is attached to an OPC tag that reads values from a PLC. I’ve tried dragging the tag into the graph, but I can’t seem to get anything to show on the graph even though the value is clearly changing in the tag. The value in question is shown by I:0_4 in the image.
Did you enable history for that tag? You can’t graph if you don’t record.