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

HVAC Control in the New Millenniumscription of the system is provided. Predefined flow elements and agraphics builder are used to create custom objects specific to the application.Operator-level diagnostics have been difficult and time consumingto setup with ladder logic. The diagnostic tools available in flowchartprogramming can provide diagnostics that automatically generate faultdetection and recovery logic, along with displayed operator error messagesand HTML-based operator repair and recovery displays. Thesetools are important for improved efficiency since they provide quickrecovery instructions to operators which substantially lowers equipmentdowntime.Integrated motion control is another benefit of flowchart programming.Motion control is one of the most significant features to be integratedwith logic into PC-based control systems. You no longer need toconfigure a separate motion controller with complex programming. Itcan be done inside a PC-based control system with a single dialog box.Embedded DevicesMany advances in computing power are taking place in portableand embedded devices like controllers and intelligent sensors. Unlikedesktop computers, these smaller units have little use for the power andsize of an operating system (OS) such as Microsoft Windows 95/98 orNT. They need an OS that is easily adaptable, compatible with a varietyof processors, and can operate without a terminal or keyboard.Microsoft’s Windows CE was developed to fill these needs. Inaddition to being operable without a terminal or keyboard, this reducedversion of the Windows OS provides support for more than 20 processorsfrom 11 manufacturers and it uses Win32 application programminginterfaces (APIs).Win32 ProgrammingDevelopers of applications for Windows can use Win32 programmingresources. The Win32 APL defines the interfaces to the Windowsplatforms that are available to a programmer.Programming using Win32 interfaces is not the only way to create©2001 by The Fairmont Press, Inc. All rights reserved.