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Interoperability
Interoperability is the objective and determining property of the Lonworks
technology. LonWorks nodes should be able to communicate with each
other fully independent of the selected transfer media, network topologies,
hardware details or operating system functions. For the development of a
LonWorks based system the levels: hardware, software, logical communica-
tion structure and physical network can be regarded and defined to a large
extent as separated from each other.
I/O module
In the I/O modules, the incoming process data is converted. Corresponding
to the different requirements, special I/O modules are available for a variety
of functions. There are digital and analog inputs and outputs and modules for
special functions (Counter modules, Terminal blocks for encoder and re-
solvers and communication modules).
I/O module configuration
See I/O module constellation.
I/O module constellation
Formation and order of the I/O modules in the node.
ISO/OSI model
The ISO-OSI model is a model developed by the ISO (International Organi-
sation for Standardization) for communication between nodes in networks.
This model is called OSI (Open System Interconnection) and is based on the
following 7 layers for communication:
No. OSI-layer
7
6
5
WAGO-I/O-SYSTEM 750
Busklemmen
Application Layer
Presentation Layer
Session Layer
Tasks
- Communications
service for the user
- Ensures the compati-
bility between applica-
tions
- Language and character
adaptation
- Data interpretation
- Opening and closing
sessions
- Participant identifi-
cation
- Communication control
Glossary • 133
Services
- SNVT Standard
- Network Variable Types
- Network variables
- Explicit Messages
- Transmission of other
frame formats
- Request/response service
- Network management
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