Z94.12.3 E - Manufacturing Automation & Computer Control

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Bibliography

EDIT. To modify the form, format, or content of data.

EIA (ELECTRONIC INDUSTRIES ASSOCIATION). A trade association of the electronics industry which formulates technical standards, disseminates marketing data, and maintains contact with government agencies in matters relating to the electronics industry.

ELECTRODE. A conductor through which an electric current enters or leaves, establishing contact with a nonmetallic part of a circuit.

ELECTRONIC DATA PROCESSING (EDP). Processing of data by means of equipment such as a digital computer that is electronic in nature.

ELECTRONIC INDUSTRIES ASSOCIATION. (See EIA.)

END OF BLOCK (EOB). The end of one block of data.

END-OF-BLOCK SIGNAL. A code that indicates the end of a block of data.

END OF PROGRAM (EOP). Miscellaneous function signifying the last block of a program and the completion of a workpiece.

END OF A TAPE (EOT). Miscellaneous function signaling the spindle, coolant, and feed to stop after the completion of all the commands in a block. This function is also used to reset control and/or the machine.

EQUATION SOLVER. Usually an analog device used to solve linear simultaneous nondifferential equations, etc.

ERASABLE PROGRAMMABLE READ ONLY MEMORY (EPROM). Most of these ROMs are 256 words by 8 bit electrically programmable and are ideally suited for uses where fast turnaround and pattern experimentation are important. They generally undergo complete programming and functional testing on each bit position prior to shipment insuring 100% programmability. Some types are packaged in a 24 pin dual in-line package with a transparent quartz lid. The transparent quartz lid allows the user to expose the chip to ultraviolet light to erase the bit pattern. A new pattern can then be written into the device. This procedure can be repeated as many times as required. The circuitry of some types is entirely static; no clocks are required. A pin-for-pin metal mask programmed ROM is ideal for large volume production runs of systems; most are fabricated with silicon gate technology. This low threshold technology allows the design and production of higher performance MOS circuits and provides a higher functioning density on a monolithic chip than many conventional MOS technologies.

ERROR. (1) Refers to any incorrect step, process, or result in a computer or data-processing system. The term also refers to machine malfunctions or "machine errors,'' and to human mistakes or "human errors.'' (2) Any discrepancy between a computed, observed, recorded, or measured quantity and the true, specified, or theoretically correct value or condition. Contrast with mistake.

EXAPT. (1) Acronym for Extended Subset of APT, a language process developed in Germany and commonly used for point-to-point or lathe work. (2) The processors select the work sequence and tool and determine the cutting data such as feed rates, spindle speeds, depths of cut and so on. The processor is based on APT.

EZAPT. An APT based NC processor language that is implemented on a microcomputer system with two disk drives. The processor can be used to program all NC machine tools with two-axis circular and three-axis linear and four-axis position (rotary tables and so on) capabilities.

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