Open architecture for control is coming, but when?
J. R. Pollard · InTech · 1996
{open_quotes}Open architecture{close_quotes} (OA) is one of the catch-phrases for the `90s. Does it represent the next major paradigm shift in automation? Many compare the shift to OA to the impact of the programmable logic controller (PLC) on the relay market. Are they right when they revel, {open_quotes}PLCs are dead!{close_quotes} Although OA-based control systems will most likely be the systems of choice, the timing of the shift is less clear. The Industrial Computing Society`s (ICS) panel sessions at the ISA/95 show examined open modular architecture controllers (MAC), alternate control languages, and the future of automation. The OMAC concept is described in a white paper by the three U.S. automakers. The white paper suggests what control vendors should plan for if they wish to participate in the automotive automation marketplace. It is this paper that has driven the initial move to OA in North America. The {open_quotes}Industrial Controls Intelligence Newsletter{close_quotes} reports that VMEbus, personal computers (PCs), and IEC 1131 are in and closed, proprietary systems are out. Open architecture is not just a concept. GM Powertrain, the most active proponent of OMAC, currently uses OA control systems in three plants, typically using FloPro (a flowchart programming language) and Xycom industrial computers. Onemore » system monitors and controls more than 10,000 I/O points. The move to OA, however, is happening slowly.« less