Interfacing Standardization in the Large Control System

The importance of interface standards to both users and suppliers of large process control systems is discussed together with certain admonitions as to their proper use. Issues of special import in the large system are identified with respect to the some-what dissimilar user-versus-supplier interests, and an effort is made to relate these to an existing standard. In particular, aspects to be considered include economy, fault tolerance, flexibility, ruggedness, and longevity.