The same modeling tool forms the backbone of Entivity’s (Ann Arbor, Mich.) Think & Do Studio.
The elegant, easy-to-read flowcharts can make complex interactions more intelligible at a glance. Many business people have used Microsoft Visio as a tool for modeling business processes. Think of these as toolbox essentials hammer, eight-tip screwdriver, pliers, and adjustable wrench available to the enterprising programmer.
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Tools aid general program organization, Microsoft (Redmond, Wa.) strategy and software helps, other initiatives add power to ladder and other languages, and modeling and code generation assist in embedded programming. While programming usually goes from details up. Software design begins with a top-down analysis (Natick, Mass.) January 2001 study concludes that the market for embedded operating systems and software development tools should grow at a compounded annual growth rate of 18.7% to over $2.6 billion by 2005. In fact, tools exist to help all programmers design and develop better code. The controller can be a PLC programmed with IEC 61131-3 languages like ladder diagram or function block or flow charts, DCS with function blocks with added sequential control in ladder, or embedded control in C or C++. This general process holds true for just about any control programming. Coordination of subsystems, communications, and operator interface design wrap up this part of the project. Then subsystems, like controlling the temperature of a heat exchanger or automating an assembly or machining station, are programmed. As the project evolves, increasing amounts of detail are added until input and output devices and all communications are defined.Īctual code writing and implementation usually goes from the details up to top level bringing things together. Thinking at this stage must be from the ‘top down,’ that is, one must first understand what the overall objective of the process or machine is. How many programmers in machine control still sit down at a blank screen after the mechanical design is done with a list of input and output devices and a brief functional description and begin writing logic? Probably too many.Ī programmer must be involved in the process or machine from the beginning of the project. (See also, ‘Find the Right Engineering Tools in this issue.)
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Many program editors now emulate Microsoft’s Visual Studio format with multiple windows and toolbars, pull-down menus, and visible ‘tree’ structure for the project. Today’s tools aid program organization and provide powerful command sets that make complex control easier and faster to accomplish. Software programming no longer entails sitting before a blank screen and either entering contacts and coils or typing arcane commands and keywords that become long strings of spaghetti in ladder or text.
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