Emerson ROC827 - Manual (Page 130)

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.