Glossary
Appendix D
D-17
Octal Numbering System
A numbering system that uses only the digits 0 through 7. Also
called base-8.
Off Line
Equipment or devices that are not connected to, or do not directly
communicate with, the central processing unit.
On Line
Equipment or devices which communicate with the device it is
connected to.
Online Data Change
Allows the user to change various data table values using a peripheral
device while the application is operating normally.
Online Editing
Allows the user to modify a program using a peripheral device while the
application is operating normally.
One-Shot
A programming technique which sets a storage bit or output bit for only
one program scan. See Leading Edge One-Shot and Trailing Edge
One-Shot.
Open System
A system that can be connected to other systems because of compliance to
some established standard(s).
Operating System
A software system that controls the operation of a processor system by
providing for input/output, allocation of memory space, or translation
of programs.
Output
Information transferred from processor images table words through output
modules to control output devices.
Output Devices
Devices such as solenoids and motor starters that receive data from the
programmable controller.
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