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Welcome to Module 25, Electronic Operator Interfaces. Operator interfaces, often shortened to OI, are the technology that allows humans to control and monitor machines and plant operations . Early forms of OI included the steam pressure gauges on old locomotives, and pushbuttons and chart recorders. Starting in the 1980s, electronic operator interface devices became available to provide a more compact, manageable, and flexible way for plant personnel to interact with plant processes . Electronic OIs typically feature some type of luminous display and often include a method for personnel to perform inputs. Using software, electronic OI can be on-screen replacements for indicating lights, gauges, message displays, and other conventional hardwired devices. The remainder of this module explores the design and function of electronic OI products. 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 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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