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ROC827 Instruction Manual
Issued Mar-06 Glossary A-4
H
HART
Highway Addressable Remote Transducer.
Holding
Register
Analog output number value to be read.
Hw
Differential pressure.
Hz
Hertz.
I, J
IC
Integrated Circuit. Also, Industry Canada (more recently known as Measurement
Canada), an organization that grants custody transfer approvals on certain ROC units.
ID
Identification.
IEC
Industrial Electrical Code or International Electrotechnical Commission. See
http://www.iec.ch.
IEEE
Institute of Electrical and Electronic Engineers. A professional organization that, in
conjunction with the International Standards Organization (ISO), establishes and
maintains the Open System Interconnection (OSI) reference model and an international
standard for the organization of local area networks (LANs). Refer to http://www.ieee.org.
IMV
Integral Multiplier Value, used in AGA3 (orifice) calculations.
Input
Digital input, a bit to be read.
Input Register
Input numeric value to be read.
Local Port
Also LOI; the serial EIA-232 (RS-232) port on the ROC through which local
communications are established, typically for configuration software running on a PC.
I/O
Input/Output.
I/O Module
Module that plugs into an I/O slot on a ROC to provide an I/O channel.
IRQ
Interrupt Request. Hardware address oriented.
ISO
International Standards Organization. See http://www.iso.ch.
IV
Integral Value.
K
KB
Kilobytes.
KHz
KiloHertz.
L
LCD
Liquid Crystal Display.
LDP
Local Display Panel, a display-only device that plugs into ROC300-Series units (via a
parallel interface cable) used to access information stored in the ROC.
LED
Light-Emitting Diode.
Logical Number
The point number the ROC and ROC Plus protocols use for I/O point types are based on
a physical input or output with a terminal location; the point numbers for all other point
types are “logical” and are simply numbered in sequence.
LNK
Ethernet has linked.
LOI
Local Operator Interface (or Local Port). Refers to the serial EAI-232 (RS-232) port on
the ROC through which local communications are established, typically for configuration
software running on a PC.
LPM
Lightning Protection Module; a device that provides lightning and power surge protection
for ROCs.
LRC
Longitudinal Redundancy Checking error checking.