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A binary number is base 2, whereas normal numbering systems are base 10.

blast furnace -a furnace that generates high temperatures by blowing air into the combustion.

bleed nozzle -a valve or nozzle for releasing pressure from a system.

block diagram -a symbolic diagram that illustrates a system layout and connection. This can be ued for analysis, planning and/or programming.

BOC (Bell Operating Company) -there are a total of 7 regional telephone companies in the U.S.A.

boiler -a device that will boil water into steam by burning fuel.

BOM (Bills Of Materials) -list of materials needed in the production of parts, assemblies, etc. These lists are used to ensure all required materials are available before starting an operation.

Boolean -a system of numbers based on logic, instead of real numbers. There are many similarities to normal mathematics and algebra, but a separate set of operators, axioms, etc. are used.

plc glossary -35.5

bottom-up design -the opposite of top-down design. In this methodology the most simple/basic functions are designed first. These simple elements are then combined into more complex elements. This continues until all of the hierarchical design elements are complete.

bounce -switch contacts may not make absolute contact when switching. They make and break contact a

few times as they are coming into contact.

Bourdon tube -a pressure tube that converts pressure to displacement.

BPS (Bits Per Second) -the total number of bits that can be passed between a sender and listener in one

second.

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