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Abbreviation
PATA
PC
PCI
PCMCIA
PE
PG
PIC
POST
PS/2
PXE
RAID
RAM
RI
ROM
RS 485
RTC
RTS
SIMATIC Rack PC IL 43
Operating Instructions, Edition 09/2005, A5E00432875-01
Term
Parallel ATA
Personal Computer
Peripheral Component Interconnect
Personal Computer Memory Card
International Association
Protective Earth
Programming device
Programmable Interrupt Controller
Power On Self Test
Personal System 2
Preboot Execution Environment
Redundant Array of Independent Disks
Random Access Memory
Ring Input
Read-Only Memory
Reconciliation Sublayer 485
Real Time Clock
Reliable Transfer Service
Definition
An interface for hard disk drives and optical
drives with parallel data transfer of up to 100
Mbps
High-speed expansion bus
Association consisting of approx. 450 member
companies of computer industry. Their focus is
set on providing worldwide standards for
miniaturization and flexible use of PC expansion
cards, and thus to provide a basic technology to
the market.
Compact programming device which meets the
special requirements of industry. The PG is fully
equipped for programming SIMATIC PLCs.
Programmable interrupt controller
Self-test performed by the BIOS after the
computer is switched on. Performs a RAM test
and a graphic 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.
PC architecture introduced by IBM towards the
end of the 1980 decade; was originally designed
to replace the open system of the PC AT/XT
format.
Software for running new PCs without hard disk
data via the network
Redundant hard disk array. Data storage system
which is used to store data alongside with the
error correction codes (e.g. parity bits) on at least
two hard disks, in order to increase system
reliability and performance. The hard disk array is
controlled by management programs and a hard
disk controller for error correction. The RAID
system is usually implemented in network
servers.
Main or work memory of a computer with direct
access, allowing read access to data and editing.
Incoming call
Semiconductor memory, can be also used for
storing non-volatile data and programs in the
manufacturing phase. Data stored on the ROM
chip are read-only, and can neither be erased nor
rewritten.
Bi-directional bus system designed for up to 32
nodes
Real-time clock
Request to send
Abbreviations
C.1 Abbreviations
C-5
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