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In order to clarify the interrelationships between DeviceNet, ControlNet and
EtherNet/IP, the following diagram presents the associated ISO/OSI reference
model.
(e.g. positioning controllers, semi-conductors, pneumatic valves)
7 Application
6 Presentation
5 Session
4 Transport
3 Network
2 Data Link
1 Physical
4.3.2 Characteristics of the EtherNet/IP Protocol Software
Level 1
Level 2
WAGO-I/O-SYSTEM 750
ETHERNET TCP/IP
Application device profiles
layer
layer
(explicit messages, I/O messages)
CIP message routing, connection management
layer
DeviceNet or ControlNet
layer
(transmission control,
addressing)
layer
CAN (CSMA/NBA) or
layer
ControlNet (CTDMA)
DeviceNet or ControlNet
layer
physical interface
Level 1: Explicit Messages Server
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,
Class 1 connection – I/O messages (connection oriented, client
EtherNet/IP (Ethernet/Industrial Protocol)
CIP application object library
CIP data management services
transport
physical interface
client and server)
and server)
Fieldbus Communication
Encapsulation
protocol
TCP
UDP
IP
ETHERNET/IP
Ethernet
(CSMA/CD)
Ethernet
• 179
CIP
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