Rockwell Automation 1747-L5xx SLC 500 Modular Hardware Style User Manual - Manual (Page 278)

Publication 1747-UM011G-EN-P - June 2008
278 Glossary
low byte
Bits 0...7 of a word.
logic
A general term for digital circuits or programmed instructions to
perform required decision making and computational functions.
manual
Typically an acoustically coupled type of modem. The connection is
established by a person on each end of the phone line. They then
insert the handsets into an acoustic coupler to complete the
connection.
master control relay (MCR)
A hard-wired relay that can be de-energized by any series-connected
emergency stop switch.
mnemonic
A simple and easy to remember term that is used to represent a
complex or lengthy set of information.
modem
Modulator/demodulator. Equipment that connects data terminal
equipment to a communication line.
modes
Selected methods of operation. Example: run, test, or program.
maximum watts
The maximum amount of heat that the module generates with field
power present.
minimum load current
The lowest amount of current the output is designed to operate at.
Operating at or below this value is not reliable.
minimum watts
The amount of heat dissipation that can occur when there is no field
power present.