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Designing SCADA Application Software by Stuart G McCrady

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Appendix A

Glossary of Technical Terms

Appendix A offers a summary of acronyms and terms used throughout this book. Most of these terms are common in the SCADA systems industry.

Alarm    Condition in the field in which a fault or an undesirable situation has occurred; requires operator intervention.

Alias Tag    Typically the hardware reference for a program point in a controller program; can also refer to another point in the controller program, serving as an indirect reference.

Analog Data    Information that can have any number of values between two limits; the limits define the range of the analog value.

ADC    Analog to Digital Converter; Electronic interface which monitors a current or voltage and produces a binary number which represents ...

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