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I

Term Definition
I/O

Stands for "Input/Output," in automation, a term encompassing all physical connection points between a control system and the sensors and actuators of the "real world."

IGES

Initial Graphics Exchange Specification. IGES is an industry standard format for exchanging CAD data between systems.

Image processing

Techniques for filtering, storing, and retrieving images, as well as for processing pictorial information by computer.

Index

An object implemented by some relational database software that controls the order in which a table is accessed or stored.

Indexer

An electronic unit that converts high-level commands from a host computer, PLC, or operator panel into step and direction pulses needed by a stepping motor driver.

Indicator

An identified measure of a process.

Information System

The information system manages the scope, validity, reliability, selection and maintenance of quality and performance data and information. The system also provides comparative information and benchmarks. The data and information is then used to monitor and improve the integrated systems.

Input signal

A signal applied to a device, element, or system.

Instrument

the term for any item of electrical or electronic equipment designed to carry out a specific function or set of functions. A device for measuring the value of an observable attribute. The instrument may also control the value.

Instrumentation

systems of instruments used to observe and control a physical object or process.

Integrated circuit

A small, complete circuit of interconnected semiconductor devices such as transistors, capacitors, and resistors printed in a single silicon chip.

Interface

a shared boundary between two pieces of equipment. Hardware and associated software needed to enable one device to communicate with another.

Interlock

A device that prevents a machine from initiating an operation until a condition or set of conditions is fulfilled.

Interoperability

The ability of computers on a network to share application software.

Intrinsically Safe

An instrument which will not produce any spark or thermal effects under normal or abnormal conditions that will ignite a specified gas mixture.

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