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Glossary MMC120 Linear Motion Control Module

74 Delta Computer Systems, Inc. 360/254-8688

GLOSSARY OF TERMS

Actual Position - The scaled measured axis position expressed in Position Units.

Circulation - The process of sending an interrogation signal to a transducer and counting a high frequency

clock while waiting for the transducer to respond.

Cleared - Refers to a FALSE or logic zero value.

Counts - Raw number of digital counts for a given physical distance. The number has NOT been scaled to

represent the actual physical distance.

Extending - Moving or turning the axis such that the transducer counts increase.

Feed Forward - Control industry term used to express the amount of output drive needed to reach a desired

speed, or the open loop gain of a control system.

MCM - Motion Control Module.

Overlap - Overlap is a region in a hydraulic valve where no fluid can flow in either direction; it is usually

specified in percent. Valves with large overlap are very difficult to control.

PID - Control industry term used for Proportional, Integral, and Differential drive compensation.

Position Unit - Basic unit of distance measurement for a specific application (i.e., thousandths of an inch,

tenths of millimeters, thousandths of revolutions, etc.). Position units are calculated using the SCALE

and COUNTS parameters.

Retracting - Moving or turning the axis such that the transducer counts decrease.

Scale - A multiplier used to translate Transducer Counts to Position Units. It can also be used to

compensation for differences in magnetostrictive transducers.

Set - When referring to STATUS bits it refers to a TRUE or logic one value. It also refers to a physical

positions of the axes.

Target Position- A calculated position at which an axis is expected to be at any given time.

Transducer - A general term for a device that converts a physical distance to an electrical signal.

Transducer Counts - See Counts.

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Delta MMC120 Bedienungsanleitung Seite 74