List of abbreviations/acronyms
C.1 Abbreviations
SIMATIC Rack PC 547B
Operating Instructions, 12/2007, A5E01127519-02
121
Abbreviation Term Meaning
SPP Standard Parallel Port Synonym for parallel port
SVGA Super Video Graphics Array Enhanced VGA standard with at least 256 colors
SVP Serial number of the device
SW Software
TCO Total Cost of Ownership
TFT Thin-Film-Transistor Type of LCD flat-screen
TTY Tele Type Asynchronous data transfer
TxD Transmit Data Data transfer signal
TWD Watchdog Time Watchdog monitoring time
UL Underwriters Laboratories Inc. US organization for tests and certifications
according to own or binational standards (with
CSA / Canada) standards
UMA Unified Memory Architecture Video memory
URL Uniform Resource Locator Designation of the full address of an Internet
page
USB Universal Serial Bus
UXGA Ultra Extended Graphics Array Graphic standard, maximum resolution
1600x1200 pixels.
V.24 ITU-T standardized recommendation for data
transfer via serial ports
VDE Verein deutscher Elektrotechniker (Union
of German Electrical Engineers)
VGA Video Graphics Array Video adapter which meets industrial standard
VRM Voltage Regulator Module
W2k Windows 2000
WAV Wave Length Encoding Loss-free file format for audio data
WD Watchdog Program monitoring with error detection and
alarming.
WLAN Wireless LAN LWireless local area network
WWW World Wide Web
XGA Extended Graphics Array Graphic standard, maximum resolution 1024x768
pixels.
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