Fieldbus
Communication
•
147
EtherNet/IP (Ethernet/Industrial Protocol)
WAGO-I/O-SYSTEM 750
ETHERNET TCP/IP
to EtherNet/IP is easy to do.
Data exchange takes place with the help of an object model.
In this way, ControlNet, DeviceNet and EtherNet/IP have the same application
protocol and can therefore jointly use device profiles and object libraries.
These objects enable plug-and-play interoperability between complex devices
of different manufacturers.
In order to clarify the interrelationships between DeviceNet, ControlNet and
EtherNet/IP, the following diagram presents the associated ISO/OSI reference
model.
Application device profiles
(e.g. positioning couplers, semi-conductors, pneumatic valves)
7 Application
layer
CIP application object library
6 Presentation
layer
CIP data management services
(explicit messages, I/O messages)
5 Session
layer
CIP message routing, connection management
CIP
4 Transport
layer
Encapsulation
protocol
TCP
UDP
3 Network
layer
DeviceNet or ControlNet
transport
(transmission control,
addressing)
IP
2 Data Link
layer
CAN (CSMA/NBA) or
ControlNet (CTDMA)
Ethernet
(CSMA/CD)
1 Physical
layer
DeviceNet or ControlNet
physical interface
Ethernet
physical interface
ETHERNET/IP
4.3.2 Characteristics of the EtherNet/IP Protocol Software
Level 1
Level 1: Explicit Messages Server
Level 2
Level 2: Level 1 + I/O Messages Server
•
Unconnected Message Manager (UCMM) Client and Server
•
128 Encapsulation Protocol sessions
•
128 Class 3 or Class 1 Connections combined
Class 3 connection – explicit messages (connection oriented,
client and server)
Class 1 connection – I/O messages (connection oriented, client
and server)
Содержание 750-341
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