HVAC Control in the New Millennium.pdf - HVAC.Amickracing

HVAC Control in the New Millenniumto Visual Basic and other languages.OPC has become the main technology for connecting industrialsoftware applications. OPC makes small custom applications easy togenerate and support (Figure 5-5).Proprietary object technologies have been used by companies suchas CSI, Foxboro and Honeywell. OPC is now used extensively throughoutHoneywell’s products.It provides a standardized function, which allows many new kindsof information integration to occur although it is not as sophisticated asmany existing proprietary access schemes. The availability of a morebasic and functionally inferior standard access mechanism has beenenough to replace many older proprietary schemes. One problem withFigure 5-5. OPC has its roots in the Microsoft DCOM (DistributedComponent Object Model) technology, which communicates over networks,and is part of Microsoft DNA.©2001 by The Fairmont Press, Inc. All rights reserved.