Section 2 Functional Description CI873 Connections
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Explicit Messaging (Class 3 or UCMM)
Unconnected explicit messaging is used for configuration. It is transmitted over a
TCP connection.
• Explicit messages provide a one-time transport
of data item. They can be sent
as connected or unconnected. These messages are typically point-to-point.
• Explicit messages provide the typical requ
est or response-oriented network
communications.
• Predominantly used for device configuration and diagnostics.
For class 3, communication is tag based.
CIP Connection Time-out Calculation
T -> O RPI value should suit the requirement of the application. The lowest value
configurable to this parameter is 10ms, which results in the fastest possible
communication.
The Requested Packet Interval (RPI) is the requested time interval between packets
in case of Implicit communication for I/O data transfer. In the T -> O RPI
parameter on the EtherNet/IP target, the time interval between packets received by
CI873 EtherNet/IP I/O scanner from target, can be configured.
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