Siemens SIMATIC IPC427D Operating Instructions Manual page 194

Glossary
Motherboard
The motherboard is the core of the computer. Here, data are processed and stored, and
interfaces and device I/Os are controlled and managed.
Operating system
Generic term which describes all functions for controlling and monitoring user program
execution, distribution of system resources to the user programs and the operating mode in
cooperation with the hardware (for example, Windows 7 Ultimate).
Pixel
The pixel represents the smallest element that can be reproduced on-screen or on a printer.
Plug&Play
Generally, a reference to the ability of a computer to automatically configure the system for
communication with peripheral devices (for example monitors, modems or printers). The
user can plug in a peripheral and "play" it at once without manually configuring the system. A
Plug&Play PC requires both a BIOS that supports Plug&Play and a Plug&Play expansion
card.
POST
Self-test performed by the BIOS after the computer is switched on. Performs a RAM test and
a graphics controller test, for example. The system outputs audible signals (beep codes) if
the BIOS detects any errors; the relevant message indicating cause of error is output on the
screen.
Programmable controller
The programmable controllers of the SIMATIC S5 system consist of a central controller, one
or several CPUs and various other modules (for example, I/O modules).
PXE server
A Preboot Execution Environment server is part of a network environment and can provide
software to connected computers even before they boot. This can involve operating system
installations or servicing tools, for example.
RAL
Restricted Access Location: Installation of the device in a production facility with restricted
access, for example, a locked control cabinet.
Recovery function of the USB stick
Contains the tools for configuring hard disks and the Windows operating system.
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Operating Instructions, 05/2017, A5E31347215-AB
SIMATIC IPC427D