Abstract: The invention describes use of tags in an operator interface panels. The tags are descriptive names of variables used in the panel. The use of tags allows a user to use meaningful names to the variables used with the objects on the panel.

Abstract: The invention implements a means of making objects visible or invisible on HMI display. The object's visibility can be under the user control and/or under the control of connected controller, thereby making the objects context-sensitive. Context-sensitive visibility helps in designing less congested screens thereby making them more operator-friendly. In addition said screens are safer as they eliminate unintentional activation of nearby controls, and eliminate unnecessary and unauthorized activation of controls.

Abstract: A system and method for monitoring the tension loading of a conveyor chain (12) utilizing a transducer (22) that is mounted on the chain to travel therewith and generate an electrical signal based on the tension of the chain (12) and a data logger (60) mounted on the chain for converting the electrical signal into tension data for storage in a memory (132) of the logger on the chain. The system also includes an infrared transmitter (146 ) for generating a position signal representing a predetermined position of the chain (12). The method utilizes the data logger (60) and involves mounting the logger on the chain and placing the chain under tension. The method further involves generating an electrical signal based on the tension of the chain, converting the electrical signal into tension data and storing the tension data in the memory on the chain.