ISA 5.3 – Graphic Symbols for Distributed Control-Shared Display Instrumentation, Logic & Computer Systems
Formerly S5.3-1983. Establishes documentation for that class of instrumentation consisting of computers, programmable controllers, minicomputers, and microprocessor-based systems that have shared control, shared display or other interface features. Symbols are provided for interfacing field instrumentation, control room instrumentation, and other hardware to the above. Terminology is defined in the broadest generic form to describe the various categories of these devices.
