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MELSEC-Q
3 SPECIFICATIONS
(c) Change-of-state
As shown in the following diagram, the communication method that
executes the communication of [1] and [2] as the I/O data changes is the
change-of-state communication, and the connection that uses this
communication is the change-of-state connection.
No data transmission is performed unless the I/O data is changed.
1) When the output data of the master node changes, the data is sent to
the slave node.
2) When the input data of the slave node changes, the data is sent to the
master node.
There is no concept of the network scan in the change-of-state
communication.
Master node
1) 2)
Slave node