Connection Types

There are two types of messaging connections: I/O messaging connection and Explicit messaging connection.

I/O messaging connection includes the two methods explained below:

Connection Method	Description
Change Of State	A device sends data whenever it changes. Signals for device diagnosis are sent regularly in the background. This connection type is useful for remedying EtherNet/IP communication traffic.
Cyclic	A slave device transfers data regularly according to its internal timer. This connection type is typically used for communicating with a temperature Controller. The data transfer frequency is defined by master configuration.

KEY POINTS

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For Change of State and Cyclic, the ACK which verifies communication completion can be disabled by setting. However, never disable the ACK since communication errors cannot be detected.