Rockwell-automation 1771-QB Linear Pos. Manual de usuario descargar pdf (Pagina 173)

Glossary of Terms & Abbreviations

Appendix A

A4

LS: Least significant (word, byte, or bit).

mA: Milliamperes, a unit of measurement for electric current.

Memory: A group of circuit elements that can store data.

Millisecond (ms): One thousandth of a second.

Module: A unit of a larger assembly.

Motion Block: A block containing motion segments and, optionally, a

programmable I/O configuration word.

Motion Segment: A movement profile, trigger conditions, and programmable

output options that provide an advanced axis motion description.

MS: Most significant (word, byte, or bit).

Noise: An extraneous signal in an electrical circuit capable of interfering with

the desired signal.

Open Loop: A signal path without feedback.

Overshoot: The amount that a controlled variable exceeds the desired value

after a change of input.

PID: See Proportional, Integral, and Derivative control.

PLC: Programmable Logic Controller. An A-B device that you can program to

control and monitor modules in a process control system.

PLC Programming: Storing programs and ladder logic diagrams in the PLC

data table.

Proportional Control: The component that causes an output signal to change

as a direct ratio of the error signal variation.

RAM: Random access memory.

Read: To acquire data from a source, as in a block transfer of data from an I/O

module to the PLC data table.

Read Operation: A PLC request for module status information. This may be in

the form of a status block or a status monitor byte.

intelligent I/O module to the PLC data table.

Repeatability: The ability to return to the same linear measurement along the

same axis.

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Rockwell-automation 1771-QB Linear Pos. Manual de usuario Pagina 173