B-17
TERM DEFINITION
Drip Gasoline
Hydrocarbon liquid that separates in a pipeline transporting gas from the well
casing, lease separation, or other facilities and drains into equipment from
which the liquid can be removed.
Driver (Hardware)
An electronic circuit that provides input to another electronic circuit.
Driver (Software)
A program that exercises a system or system component by simulating the
activity of a higher level component.
Drivers
Software that controls a specific hardware device, such as interface boards,
PLCs, RTUs, and other I/O devices.
Droplet Liquids
Large liquid particles
Dry Contact
Contacts which neither break nor make a circuit. 0 Ohms.
Dry Gas
Has no more than seven pounds of water per million cubic feet of gas. Gas has
less than 0.1 PPM of liquid at the coldest ambient condition expected at the
coldest point in the system. The liquid can be water, oil, synthetic lubrication,
glycol, condensed sample or any other non vapor contaminate.
DSP
Digital Signal Processor.
Dual Element Sensor
A sensor assembly with two independent sensing elements.
Dual-Access Memory
Memory that can be sequentially accessed by more than one controller or
processor but not simultaneously accessed. Also known as shared memory.
Duplex
The ability to both send and receive data simultaneously over the same
communications line.
Duplex Wire
A pair of wires insulated from each other and with an outer jacket of insulation
around the inner insulated pair.
Duty Cycle
The total time to one on/off cycle. Usually refers to the on/off cycle time of a
temperature controller.
DVI
The Port Manager and communication engine of the iVision SCADA System.
This software can multiplex among several communication formats and thus
supporting several vendor’s equipment over a single radio frequency. It
“pushes” new data to the iVision database, saving time and network resources
by not transmitting redundant data. The DVI includes the Totalflow WinCPC
code and thus supports all Totalflow software and functions – including
WinCCU, TDS, PCCU, Report by exception, cryout, etc.
Dynamic Random Access
memory
This is the most common form of computer memory It needs to be continually
refreshed in order to properly hold data, thus the term "dynamic."
E
2
Prom
See Electrically Erasable Programmable Read-Only Memory. Also called
EEPROM.
Earth
Can mean a connection to the earth itself or the negative lead to the chassis or
any point to zero voltage.
EC European
Community.
Echo
To reflect received data to the sender. i.e. depressed on a keyboard are usually
echoed as characters displayed on the screen.
Edit
Making changes to information, data or configuration files.
EEPROM
See Electrically Erasable Programmable Read-Only Memory. The PROM can
be erased by electricity.
EFI Electromechanical
Frequency
Interface.
EFM
See Electronic Flow Measurement.
EFR
Enhance Feature Release.
Electrical Interference
Electrical noise induced upon the signal wires that obscures the wanted
information signal.
Summary of Contents for XRC6490
Page 1: ...2100802 001 AB TOTALFLOW XSeries Remote Controller User s Manual ...
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Page 19: ...1 5 Standard Enclosure Cont RC 6790 X Figure 1 2 Model XRC6790 Continued on Next Page ...
Page 41: ...1 27 Totalflow Input Output Modules Cont Figure 1 16 XRC6990 Inside View ...
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Page 86: ...4 12 Replacing XRC 195 Board Cont Figure 4 5 XRC Board Connections ...
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Page 112: ...5 24 12V Communication Supply Voltage Test Cont Figure 5 9 XRC 195 Communication Wiring ...
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