Glossary • 321
Modular I/O System
ETHERNET TCP/IP
Intranet
A network concept with private network connections over which data can be
exchanged within a company.
IP
Internet Protocol. The connectionless network layer, which relies on upper
protocols to provide reliability.
ISA
Industry Standard Architecture. Offers a standard interface for the data ex-
change between CPU and periphery.
ISO/OSI reference model
Reference model of the ISO/OSI for networks with the objective of creating
open communication. It defines the interface standards of the respective
software and hardware requirements between computer manufacturers. The
model treats communication removed from specific implementations, using
seven layers.
L
LAN
Local Area Network.
Library
Compilation of modules available to the programmer in the programming
tool WAGO-I/O-PRO 32 for the creation of a control program according to
IEC 61131-3.
M
Manchester encoding
In this encoding system, a 1 is encoded as a transition from low to high and a
0 as a transition from high to low.
Modules
Functions, function blocks and programs are modules.
Each module has a declaration part and a body, the latter being written in one
of the IEC programming languages IL (instruction list), ST (structured text),
SFC (sequential flow), FBD (function block diagram) or LD (ladder dia-
gram).