CI873 Connections Section 2 Functional Description
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CI873 Connections
All connections between the CI873 EtherNet/IP I/O scanner and the EtherNet/IP
targets (like LD 800DN linking devices) can be categorized as I/O connections (also
called, implicit connections).
The following chart categorizes the message transport classes supported by
EtherNet/IP:
Implicit Messaging (Class1)
Implicit messaging connections are used for real time I/O data transfer and is
transmitted via UDP.
Class 1 can be either be tag based or connection point based.
• Also known as I/O messaging. Implicit messages are exchanged across I/O
connections with an associated connection ID. The connection ID defines the
meaning of the data and establishes the regular or repeated transport rate and
the transport class. It can be point-to-point or multicast.
• Used to transmit time critical I/O data as it is faster than Class 3.
Explicit Messaging
Unscheduled TCP/IP
Implicit Data Transfer
Scheduled UDP/IP
Unconnected UCMM n/a
Connected Class 3 Class 1
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