Emerson IEC 62591 Instruction Manual page 72

IEC 62591 Wireless Interface Instruction Manual (for ROC800-Series and FloBoss 107)
C
(continued)
C1D2 Class 1, Division 2 hazardous area
CMOS Complementary Metal Oxide Semiconductor, a type of microprocessor used in a ROC.
Coil Digital output, a bit to be cleared or set.
COL Ethernet Packet Collision.
COM Communications port on a personal computer (PC).
COMM Communications port on a ROC used for host communications. .
Note: On FloBoss 500-Series and FloBoss 407s, COMM1 is built-in for RS-232 serial
communications.
Comm Module Module that plugs into a ROC to provide a channel for communications via a specified
communications protocol, such as EIA-422 (RS-422) or HART.
CF Compare Flag; stores the Signal Value Discrete (SVD).
Configuration Refers either to the process of setting up the software for a given system or the result
of performing this process. The configuration activity includes editing the database,
building schematic displays and reports, and defining user calculations. Typically, the
software setup of a device that can often be defined and changed. Can also mean the
hardware assembly scheme.
Configuration In ROCLINK 800, the graphical display that appears when a configuration file opens. It
is a hierarchical branching ("tree-style") method for navigating within the configuration
Tree
screens.
CPU Central Processing Unit.
CRC Cyclical Redundancy Check error checking.
Crosstalk The amount of signal that crosses over between the receive and transmit pairs, and
signal attenuation, which is the amount of signal loss encountered on the Ethernet
segment.
CSA Canadian Standards Association. See http://www.csa.ca.
CSMA/CD Carrier Sense Multiple Access with Collision Detection.
CTS Clear to Send modem communications signal.
D
D/A Digital to Analog signal conversion.
DB Database.
dB Decibel. A unit for expressing the ratio of the magnitudes of two electric signals on a
logarithmic scale.
Data Carrier Detect modem communications signal. In addition, Discrete Control
DCD
Device – A discrete control device energizes a set of discrete outputs for a given
setpoint and matches the desired result against a set of discrete inputs (DI).
DCE Data Communication Equipment.
Deadband A value that is an inactive zone above the low limits and below the high limits. The
purpose of the deadband is to prevent a value (such as an alarm) from being set and
cleared continuously when the input value is oscillating around the specified limit. This
also prevents the logs or data storage location from being over-filled with data.
Device In ROCLINK 800, the graphical display that allows navigation through the PC Comm
Directory Ports and ROC Comm Ports setup screen.
DI Discrete Input.
Discrete Input or output that is non-continuous, typically representing two levels (such as on/off).
DMM Digital multimeter.
DO Discrete Output.
A-2 Glossary Revised June-2018