Siemens simatic hmi op27 Equipment Manual page 8

Abbreviations The abbreviations used in this equipment manual have the following meaning:
OP27, OP37 Equipment Manual
Release 05/99
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AM Alarm Message
ANSI American National Standards Institute
AS511 Protocol of the PU interface to SIMATIC S5
ASCII American Standard Code for Information Interchange
AU Automation Unit
CPI Control Panel Interface
CPU Central Processing Unit
DIL Dual-In-Line (package)
DP Decentral Periphery
DRAM Dynamic Random Access Memory
DKM Direct Key Module
EM Event Message
ESD Electrostatic Sensitive Device
JEIDA Japan Electronic Industry Development Asociation
LCD Liquid Crystal Display
LED Light–Emitting Diode
MPI Multipoint Interface (SIMATIC S7)
PC Personal Computer
PCMCIA Personal Computer Memory Card International Association
PLC Programmable Logic Controller
PU Programming Unit
PPI Point to Point Interface (SIMATIC S7)
SRAM Static Random Access Memory
STN Super Twisted Nematic
TFT Thin Film Transistor
TP Touch Panel
TTL Transistor-Transistor Logic
Preface
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