Siemens SIMATIC NET CP 243-1 IT Technical Manual page 134

SDRAM Synchronous DRAM (volatile memory)
SFB System Function Block
SM System Marker
SMTP Simple Mail Transport Protocol
SPS Speicher-Programmierbare Steuerung (programmable logic controller)
TCP Transmission Control Protocol
TSAP Transport Service Access Point
VB Variable Byte
Web Word Wide Web
WWW Word Wide Web
134
03/03
CP 243-1 IT
J31069-D0429-U001-A0-7618