NEMA, the National Electrical Manufacturers Association, Rosslyn, Va., recently released ICS 19-2002, Industrial Controls and Systems: Diagrams, Device Designations, and Symbols.

Flowchart diagrams include count, compare, macro, increments, and expressions. Microcontrollers (PICs) are used in control systems, and require amplification.

In addition, the group updated the document to add new symbols and recognize new automation technology, add new reference sections and add the loop instrument diagrams symbol table. “The ISA5 ...