Cyclic Communication2-22.1 Cyclic Communication Function2.1.1 Overview of Cyclic CommunicationThe cyclic communication is a function to perform data transmission with constant intervals(RPI) between PLC and PLC or PLC and I/O device on the EtherNet/IP network.In the cyclic communication, one device opens a communication line which is calledconnection for a destination device. The side which opens the connection (communicationline) is called "originator", and the side which the connection is opened is called "target".Opens connections.PLC PLC I/O deviceOriginator TargetConnection information on the cyclic communication is set in the originator. The originatorconnects to the target according to the connection information. The tag/instance required forthe connection from the originator is registered in the target.Once the connection is open, the cyclic communication begins according to the settings of theconnection information.Cyclic communicationPLC PLC I/O deviceOriginator TargetComparison of originator and targetItem Originator TargetApplicable model PLC PLC, I/O deviceWhen startingcommunicationOpens connections.(Connects to targets.)Connection is opened.(Connected from originator.)ConnectioninformationTarget connection information- IP address- Tag/InstanceCyclic communication information- RPI- Communication method, etc.Connected from originator- Tag/Instance
