A "Tag" in AVEVA InTouch refers to a named variable that represents a data point in the process control system. It is a way of identifying a specific piece of information, such as a temperature, pressure, or flow rate, within the control system.
A Tag is a representation of a physical or logical process variable, such as the temperature of a reactor or the state of a valve, in the HMI system. The Tag is assigned a unique name and is associated with a specific address in the control system, such as a memory location or a communication protocol. The Tag value is updated in real-time and is used to display the current state of the process variable on the HMI screens.
In AVEVA InTouch, the Tag concept is central to the operation of the HMI system, as it provides a way to link the physical process with the graphical representation on the HMI screens. The Tag values are used to control animations and displays, and to provide real-time process information to the operator. The Tag values can also be used in logic and calculations to drive process control and to provide advanced process visualization.
In summary, a Tag in AVEVA InTouch is a named variable that represents a data point in the process control system, providing a way to link the physical process with the graphical representation on the HMI screens.
