Siemens SIMATIC PG 720 P Manual page 114

Glossary
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
The flat monitor of the PG 720.
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
The PG 720 programming device is equipped with one hard disk drive and
one floppy disk drive.
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/
These are plug-in submodules with EPROM/EEPROM chips. S5 user
EEPROM
programs can be stored on them. These programmed submodules are then
Submodules
plugged in specially designed receptacles in the programmable logic
controller.
Extended Memory A memory extension can be installed in a programming device to increase
the size of the memory.
Glossary-4
PG 720 P Programming Device
C79000-G7076-C721-02