Siemens SIMATIC Box PC 820 Manual page 187

MS-DOS
(Microsoft Disk Operating System) is one of the standard operating systems for
personal computers. It is a single-user system.
Multipoint Interface
The multipoint interface (MPI) is the programming device interface of SIMATIC
S7/M7. It enables access to programmable modules, text displays, and operator
panels from a central point. The stations on the MPI can communicate with each
other.
N
Network
Link between programming devices and programmable controllers by means of
interface modules, physical cables, and the corresponding software to allow data
exchange between the devices.
O
Operating System
Collective term for all programs which, in conjunction with the hardware, control
and monitor execution of the user programs, the distribution of resources among
the individual user programs, and the maintenance of the operating mode (for
example, Windows 98).
P
Parallel Interface
Information is transmitted a byte at a time via a parallel interface (port). This
means that the transmission rate is very fast. The programming devices have a
parallel interface (LPT) to connect a printer.
Password
See Access Protection
PC
Personal computer
Siemens Distributor
Box PC 820 / PC FI45 V2, Manual
A5E00051531-03
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