Siemens PC 670 - Manual (Page 191)

Glossary Release 04/02
Glossary-3 Panel PC 670 Computing Unit, Equipment Manual
Interrupt
Discontinuation in the processor of a programmable controller by an interrupt
event.
IRQ
Interrupt request.
ISA
Industrial Standard Architecture (bus for expansion board)
K
Keyboard port
PS/2 keyboard connector Keyboards with an integrated trackball can be
connected.
L
LPT 1 port
The LPT 1 port (Centronics interface) is a parallel interface which can be used for
attaching a printer.
LS 120 drive
The LS 120 drive is compatible with the familiar 3.5” floppy disk drive. The LS 120
drive supports both standard floppy disks (1.44 MB) and superdisks with a capacity
of up to 120 MB.
M
Main memory
Main memory is the whole RAM on a SIMATIC PC.
Motherboard
The motherboard is the heart of SIMATIC PCs. Data are processed and saved
from here, and interfaces and device peripherals are controlled and managed.
Mouse port
PS/2 mouse connector.