Rockwell-automation 1771-QB Linear Pos. Manual de usuario descargar pdf (Pagina 172)

Glossary of Terms & Abbreviations

Appendix A

A3

Feedback Resolution: The smallest increment of dimension that the feedback

device can distinguish and reproduce as an electrical output.

Feedback Signal: The measurement signal indicating the value of a directly

controlled variable, which is compared to a commanded value to obtain

the corrective error signal.

Feedforward Control: Converting information on upstream conditions into

corrective commands to minimize the effect of disturbances.

Firmware: A series of instructions in read-only memory. These instructions are

for internal processor functions only.

Forward Motion: Axis movement in a positive direction along a coordinate

axis.

Gain: The ratio of the output of a system to its input.

Incremental Position: A position described by its distance from the previous

position along a coordinate axis.

Initialize: To cause a program or hardware circuit to return to an original state.

Integral Control: The component that causes an output signal to change as a

function of the error signal and time duration.

Instability: The state or property of a system where there is an output for which

there is no input.

Instruction: A statement that specifies an operation and the values or location

of its operands.

Integrator: A device that integrates an input signal, usually with respect to

time.

Interface: The boundary between two systems.

I/O: Input/Output

ips/s: Inches per second per second.

ISA: Instruments Society of America

Jog: A control function that provides for the momentary operation of a

servo-valve or motor for manual control of axis motion.

Linear Displacement Transducer: A position-sensing transducer mounted

along an axis.

Loop: A signal path.

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Rockwell-automation 1771-QB Linear Pos. Manual de usuario Pagina 172