Specialized Electronic Controls - Terminology

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Alternating Current (AC)

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Current flow that changes direction periodically.

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analog signal

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An analog signal is data or a value represented by a continuously variable electrical signal.

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central processing unit (CPU)

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A component in a computer that receives sensor data, analyzes it, and sends out orders to actuators to perform tasks.

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Commissioning

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The process of confirming, testing, and starting up new devices.

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Corrective Maintenance

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The process of repairing a device after a failure has already occurred.

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Digital Signal

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An electrical signal consisting of two states: either ON or OFF.

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Direct current (DC)

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Current flows in only one direction.

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Direct Digital Control (DDC)

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A type of closed-loop control system that uses microprocessors connected to sensors and actuators.

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Downloading

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The process of copying programs or information to a computer.

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Electrically Erasable Programmable Read-Only Memory (EEPROM)

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A type of memory that can be erased and reprogrammed. An EEPROM chip on a computer board is a type of read-only memory (ROM).