Rockwell-automation 1772-LV Mini-PLC - 2/15 Programmable Controller (S Manual de usuario descargar pdf (Pagina 196)

Glossary

Appendix B

B3

Byte

A sequence of binary digits usually operated upon as a unit. (The exact number

depends on the system.) In Allen-Bradley PCs, this is the smallest complete

unit of information that can be transmitted, and is made up of 8 data bits plus a

parity bit.

Cascading

A programming technique that extends the ranges of timer and/or counter

instructions beyond the maximum values that may be accumulated. This is

accomplished by means of other PC instructions.

Cassette Recorder

A peripheral device for transferring information between PC memory and

magnetic tape. In the record mode it is used to make a permanent record of a

program existing in the processor’s memory. In the playback mode it is used to

enter a previously recorded program into the processor’s memory.

Cassette Tape

A magnetic recording tape permanently enclosed in a protective housing. The

Philips type cassette is most common. Cassettes for PC use should contain

computer grade tape.

Catalog Number (cat. no.)

A designation for a specific Allen-Bradley PC unit with the major product line.

It is a 4-digit number generally followed by a dash and 2 or three alphanumeric

characters.

Central Processing Unit (CPU)

Another term for processor. It includes the circuits controlling the interpretation

and execution of the user-inserted program instructions stored in the PC

memory.

Chassis

The piece of hardware that the processor and its associated modules set into

when operating.

Character

One symbol of set of elementary symbols, such as a letter of the alphabet or a

decimal numeral.

Clear

To return a memory to a non-programmed state, usually represented as “0” or

off.

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Rockwell-automation 1772-LV Mini-PLC - 2/15 Programmable Controller (S Manual de usuario Pagina 196