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Octal
Number system based on the number 8, utilizing numbers 0 through 7.
ODBC (Open DataBase Connectivity)
A Microsoft standard designed for relational database interfacing.
OEM (Original Equipment Manufacturer)
Builds and supplies the production equipment used in a variety of industrial applications. Control products are often included as part of the package.
Off-delay timer
This is a type of timer that is on immediately when it receives its input enable. It turns off after it reaches its preset time.
Off-line programming
Programming that is done while not attached to the actual device. For example, a PLC program can be written for a PLC without being attached. The program can then be downloaded to the PLC.
OLE DB
Superceding ODBC as Microsoft's universal data access method. It allows users to view data from a wide range of devices, databases, Web data sources, applications and relational mainframes as if the data resided at a single source. It is the infrastructure component that ensures complete access to system data by all "clients".
On-delay timer
Timer that does not turn on until its time has reached the preset time value.
One-shot contact
Contact that is only on for one scan when activated.
Operating system
The fundamental software for a system that defines how it will store and transmit information.
Optical isolation
Technique used in I/O module design that provides logic separation from field levels.
Open Systems
Those systems that can be supplied by hardware components from multiple vendors, and whose software can be operated from different platforms. They are opposite to closed or proprietary systems.
Oscilloscope
A Hardware debugging tool that allows you to view the voltage on one or more electrical lines. For example, you might use an oscilloscope to determine if a particular interrupt is currently asserted.
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