Siemens Simatic 620 - Manual (Page 196)

Glossary
Glossary-6
SIMATIC Box PC 620 Manual
A5E00131465-01
Diskette
The diskette (floppy disk) is an external data 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
Flat screen monitor of the PG.
Dormancy
An energy saving power management mode that shuts down the monitor and hard
disk after all data found in the work memory have been saved to the hard disk
(Save to Disk). The PG will then be shut down.
Double-Click
Pressing and releasing the left mouse button very quickly twice in succession with-
out moving the mouse. This action is normally to open an object or program.
Drives
Devices for operating rotary disk media (diskettes, hard disk, CDs).
Drivers
These are programs which are part of the operating system. They adapt user
program data to the specific formats required by 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.
DVD
Digital Video Disc. A digital video disc can store greater amounts of data than a
traditional CD. A standard single-layer, single-sided digital video disc can store 4.7
GB of data; a two-layer standard increases the single-sided disc capacity to 8.5
GB. Digital video discs can be double-sided with a maximum storage of 17 GB per
disc. A digital video disc player is needed to read digital video discs; this player is
equipped to read older optical storage technologies.