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Welcome to Module 17, which is about Pushbuttons and Stacklights. These are devices to help someone change how a machine works, or understand its current state . The term “pushbutton” is used to refer to two different things. The first is a specific type of button assembly that you actually push on a panel. The second is the general group of components, or mechanical man/machine interface products , which includes: Indicating Lights, Selector Switches, Potentiometers—and pushbuttons—by which people interact with machines.
Figure 1. Pushbuttons Like the other modules in this series, this one presents small, manageable sections of new material followed by a series of questions about that material. Study the material carefully, then answer the questions without referring back to what you’ve just read. You are the best judge of how well you grasp the material. Review the material as often as you think necessary. The most important thing is establishing a solid foundation to build on as you move from topic to topic and module to module. A Note on Font Styles Key points are in bold. Glossary items are italicized and underlined the first time they appear.
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