This property is used to control the generation of the OnTagRead event, which occurs in the I/O Driver that contains this I/O Tag. If this property is set to True, then this I/O Tag's OnTagRead event is enabled. Otherwise, it is disabled. I/O Tags, I/O Blocks, and I/O Block Elements can generate this event. The event occurs in the I/O Driver, and not in the I/O Tag.