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L

Term Definition
Ladder logic

symbolic representation illustrates schematically the functions of a control circuit. The power lines form the sides of a ladder-like structure, with the program elements arranged to form the rungs.

Lag
  1. A time delay between the output of a signal and the response of the instrument to which the signal is sent.
    2. A time relationship between two waveforms where a fixed reference point on one wave occurs after the same point of the reference wave.
LAN

Local Area Network. A network that takes advantage of the proximity of computers to offer relatively efficient, higher-speed communications than long-haul or wide-area networks.

LAP

Link Access Protocol.

LED

Light-Emitting Diodes are solid-state devices that radiate in the visible region. They are used in alphanumeric displays and as indicator or wiring lights.

Life Cycle

The minimum number of pressure cycles the transducer can endure and still remain within a specified tolerance.

Limit switch

an electromechanical device positioned to be actuated when a certain motion limit occurs, thereby deactivating the actuator causing the motion.

Limits of Error

A tolerance band for the thermal electric response of thermocouple wire expressed in degrees or percentage defined by ANSI specification MC-96.1 (1975).

Linear

said of any device or motion where the effect is exactly proportional to the cause.

Linear load

A predictable nonprocess energy load that has a profile that changes with time and condition.

Linear programming

A management technique applied to problems in which a linear function of a number of variables is subject to a number of constraints in the form of linear inequalities. Developed as a technique for planning the diversified activities of the U.S. Air Force, the process generates several different plans, requiring a criterion for deciding which plan is best and how to find it. Mathematically, linear programming is the analysis of problems in which a linear function of a number of variables is to be maximized or minimized when those variables are subject to a number of restraints in the form of linear inequalities.

Linearity

The maximum deviation of the calibration curve from a straight line between zero and full scale, expressed as a percent of full scale output and measured on increasing measured only.

Load cell

a transducer for the measurement of force or weight. Action is based on strain gages mounted within the cell on a force beam.

Loop bandwith

Maximum rate at which a control loop can respond to a change in a control parameter. It's indicative of loop performance and is expressed in Hertz (Hz).

Loop Resistance

The total resistance of a thermocouple circuit caused by the resistance of the thermocouple wire. Usually used in reference to analog pyrometers which have typical loop resistance requirements of 10 ohms.

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