Glossary
Appendix D
D-13
Load
(1) The power used by a machine or apparatus. (2) To place data into an
internal register under program control. (3) To place a program from an
external storage device into central memory under operator control.
Load Resistor
A resistor connected in parallel with a high impedance load so the output
circuit driving the load can provide at least the minimum current required
for proper operation.
Local I/O Processor
A processor where I/O distance is physically limited and must be located
near the processor. However, it may still be mounted in a separate
enclosure. See Remote I/O Processor.
Location
A storage position in memory. Uniquely specified in Allen-Bradley
processors by 5-, 6-, 7-, 8-, or 9-digit address.
Logic
A systematic means of solving complex problems through the repeated use
of the AND, OR, NOT functions (they can be either true or false). Often
represented by ladder diagrams.
Logic Diagram
A diagram which represents the logic elements and their interconnections.
Logic Level
The voltage magnitude associated with signal pulses representing ones and
zeros (1 and 0) in binary computation.
Loop
A sequence of instructions which is executed repeatedly until a terminating
condition is satisfied.
Low=True
A signal type where the lower of two voltages indicates a logic state of ON
(1). See High=True.
Lower Nibble
The four least significant bits of a byte.
LSB
See Least Significant Bit.
LSD
See Least Significant Digit.
