EtherNet/IP information
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4.2 EtherNet/IP transmission types
The EtherNet/IP communication protocol CIP above TCP and UDP is used for
following purposes:
1. Control
2. Configuration
3. and Monitoring or Collection of data
The control portion of CIP is used for real-time I/O messaging or
Implicit
Messaging
. The information portion of CIP is used for message exchange or
Explicit Messaging
.
Figure 2:TCP/IP Stack Handling
4.2.1
Explicit Messaging, exchange of information’s
Non-time critical data transfers, typically large packet size. Information data
exchanges are short-lived explicit communication relationships
Unconnected
Messaging
or long-lived explicit communication relationships
Connected
Messaging
between one originator and one target device. Information data packets
use the TCP/IP protocol about the port 44818 and take advantage of the TCP data
handling features.
4.2.2 Implicit Messaging, exchange of I/O data
Time-critical data transfers, typically smaller packet size. I/O data exchanges are long-
term implicit connections between one originator and any number of target devices.
I/O data packets use the UDP/IP protocol about the port 2222 and take advantage of
high-speed throughput capability of UDP. This type of data exchange is used for the
communication with I/O devices, but also for the real time locking between controls.
