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This is becoming the method of choice for most long distance data lines because of the low losses and immunity to EMI.

FIFO (First In First Out) -items are pushed on a stack. The items can then be pulled back off last first. file -a concept of a serial sequence of bytes that the computer can store information in, normally on the disk.

This is a ubiquitous concept, but file is also used by Allen Bradley to describe an array of data. filter -a device that will selectively pass matter or energy. firmware -software stored on ROM (or equivalent). flag -a single binary bit that indicates that an event has/has not happened. flag -a single bit variable that is true or not. The concept is that if a flag is set, then some event has

happened, or completed, and the flag should trigger some other event. flame -an email, or netnews item that is overtly critical of another user, or an opinion. These are common

because of the ad-hoc nature of the networks. flange -a thick junction for joining two pipes. floating point -uses integer math to represent real numbers.

plc glossary -35.13

flow chart -a schematic diagram for representing program flow. This can be used during design of software,

or afterwards to explain its operation.

flow meter -a device for measuring the flow rate of fluid.

flow rate -the volume of fluid moving through an area in a fixed unit of time.

fluorescence -incoming UV light or X-ray strike a material and cause the emission of a different frequency

light.

FM (Frequency Modulation) -transmits a signal using a carrier of constant magnitude but changing frequency.

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