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Diskette
The diskette (floppy disk) is an external direct access memory on which all types of
files and programs can be stored. The storage medium is a round magnetic disk in
a plastic cover to protect it from getting scratched.
Display
The monitor of the PG 740 PII.
Double-Click
Pressing and releasing the left mouse button very quickly twice in succession
without moving the mouse. This action is normally to open an object or program.
Drives
Drives are used to hold rotating storage media (diskettes, hard disk, CDs).
Drivers
These are programs which are part of the operating system. They adapt the data
from user programs to the specific formats required by the I/O devices such as
hard disk, printers and monitors.
Drop-Down Menu
In graphics-supported programs, a menu line is positioned on the top edge of the
screen. The menu titles contained in this line can be set either as drop-down or
pull-down menus. Drop-down menus "roll" down as soon as the mouse pointer
passes over a menu title. Pull-down menus only "roll" down when the menu title is
clicked on. Different functions can then be called from these menus by moving the
mouse and clicking on an item in a menu.
E
EPROM/EEPROM Submodules
These are plug-in submodules with EPROM/EEPROM chips. S5 user programs
can be stored on them. These programmed submodules are then plugged in
specially designed receptacles in the programmable controller.
Ethernet
Local network (bus structure) for text and data communication with a data
transmission rate of 10 or 100 Mbps.
SIMATIC Box PC 840 Manual
A5E00085984-04
Glossary
Glossary-5
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