S600 Instruction Manual
D
DAC
Digital to Analog converter, also known as the D/A converter.
Databus
A group of bi-directional lines capable of transferring data to and from the CPU storage
and peripheral devices.
DCU
Data Concentrator Unit.
DI
Digital input, as known as DIGIN.
Digital
A signal with only two states, such as on/off, input/output, or 5V/0V.
DO
Digital output, also known as DIGOUT.
DP
Differential Pressure.
DPR
Dual Pulse Receiver or turbine input.
DRAM
Dynamic Random Access Memory. Volatile storage memory used in the S600. When
power is removed from the S600, the contents of the DRAM memory are lost.
DVM
Digital voltmeter.
DVS
Dual-Variable Sensor. A device that provides static and differential pressure inputs to a
ROC.
E
Ethernet
Network hardware connection.
Exponent
Base 10 multiplier.
F, G
Flash memory
Non-volatile storage memory. Although slower to access than SRAM and DRAM, once
programmed it retains the data and requires no further support. In the S600,
configuration files and the operating system are typically stored in Flash memory.
Write protect jumpers are used to prevent accidental programming of Flast memory.
FRQ
Frequency or period report.
H
Hex
Hexadecimal, referring to numbers in base 16 (that is, numbers from 0 through 9 and
letters from A through F).
Holding
Register
Analog output number value to be read.
Hw
Differential pressure.
Hz
Hertz.
I, J, K
Integer
A whole number.
Intelligent I/O
P144 Intelligent Input Output Module, also known as IIO.
I/O
Input and Output.
IP
Institute of Petroleum or Ingress protection standard, referring to British standard 5420
or International Electro-Technical Commission standard 144.
IPL 600
Interactive program loader tool used to transfer application programs from a PC to the
S600.
IS
Intrinsically Safe.
L
LED
Light-Emitting Diode (an indicator).
A-2 Glossary Revised Aug-06
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