B-34
TERM DEFINITION
Ole for Process Control
This is a data interchange format and supporting software. Typically, vendors
(such as ABB) write OPC server drivers which can talk to their devices. SCADA
system vendors (again like ABB) write OPC clients that can gather data from
OPC Servers. The idea is to provide a universal way to collect data into a
SCADA system regardless of the equipment vendor. This standard was
developed and is maintained by the OPC Foundation. The Totalflow Driver,
TDS32, supports OPC.
Ole for Process Control
Database
A programming interface to databases. IVision supports the OLEDB interface.
OLEDB
See Ole for Process Control Database.
Olefins
Basic chemicals made from oil or natural gas liquids feedstocks; commonly
used to manufacture plastics and gasoline. Examples are ethylene and
propylene.
OOP
Object-Oriented Programming. The XFC/XRC architecture incorporates an
object-oriented approach.
OPC
See Ole for Process Control.
Open Circuit
A complete break in a metal conductor path.
Open Circuit Voltage
The difference in potential between the terminals of a cell/battery when the
circuit is open (no-load condition).
Open Collector
A single NPN transistor with the base connected to the logic driving circuitry
and with the emitter grounded. The collector is the output pin of the gate.
Open Database
Connectivity
A widely accepted application-programming interface (API) for database
access. It is based on the Call-Level Interface (CLI) specifications from X/Open
and ISO/IEC for database APIs and uses Structured Query Language (SQL) as
its database access language. Using ODBC, you can create database
applications with access to any database for which your end-user has an
ODBC driver. This allows access for authorized users to databases over any
network, including the Internet. The iVision SCADA system provides an ODBC
driver, making the database accessible to authorized users anywhere on a
corporate network, or even over the Internet if the network is properly
configured.
Operating System
Base-level software that controls a computer, runs programs, interacts with
users, and communicates with installed hardware or peripheral devices.
Optional Equipment Unit
Totalflow enclosure designed to house optional power and communication
devices.
Orifice Meter
Device to record differential pressure measurement which uses a steel plate
with a calibrated hole or orifice to generate a drop in pressure between the two
sides of the plate. Also the primary element of the meter run.
Orifice Plate
A plate of non-corrosive material which can be fastened between flanges or in a
special fitting perpendicular to the axis of flow and having a concentric circular
hole. The primary use is for the measurement of gas flow.
ORing
Boolean algebra logical function. Described as the addition or summing of
switches or inputs, in the case of Boolean elements, the 0 and 1 represent two
possible states of a premise or hypothesis: True or False, On or Off. When
adding Boolean elements not real numbers, you will find these results:
1 or 1 = 1
1 or 0 = 1
0 or 1 = 1
0 or 0 = 0
O-Ring
A flat ring made of rubber or plastic, used as a gasket.
Output
That part of a circuit where the processed signal is available.
Output Impedance
The resistance as measured on the output terminals of a pressure transducer.
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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