ROC364 Instruction Manual
G-3 Glossary
Rev
Jun/05
I, J
I/O
– Input/Output.
I/O Module
– Module that plugs into an I/O slot on a ROC to provide an I/O channel.
IEC
– Industrial Electrical Code.
K
Kbytes
– Kilobytes.
kHz
– Kilohertz.
L
LCD
– Liquid Crystal Display. Display only device used for reading data.
LDP
– Local Display Panel. A display-only device that plugs into a ROC unit via a parallel interface
cable. The LDP consists of a 4-line by 20-character alphanumeric display and four keys used to
access information stored by the ROC.
LED
– Light-emitting diode.
LOI
– Local Operator Interface. Refers to the serial EIA-232 (RS-232) port on the ROC through which
local communications are established, typically for configuration software running on a PC.
LPM
– Lighting Protection Module provides lightning and power surge protection for ROC units that
use I/O Modules.
M
mA
– Milliamp(s); one thousandth of an ampere.
MCU
– Master Controller Unit.
Modbus
– A popular device communications protocol developed by Gould-Modicon.
Modular I/O
– I/O channels that are provided on a ROC by means of I/O modules. See I/O Module.
MPU
– Micro-processor Unit.
mW
– Milliwatts, or 0.001 watt.
mV
– Millivolts, or 0.001 volt.
MVS
– Multi-Variable Sensor. The MVS provides differential pressure, static pressure, and temperature
inputs for orifice flow calculation.
N
NEC
– National Electrical Code.
NEMA
– National Electrical Manufacturer’s Association.
O
OH
– Off-Hook modem communications signal.
Off-line
– Accomplished while the target device is not connected (by a communications link). For
example, off-line configuration is configuring a ROC in a electronic file that is later loaded into the
ROC.