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MELSEC-Q
3 SPECIFICATIONS
(3) Overview of each connection type
The following explains an overview of each connection type used during the I/O
communication.
(a) Polling
As shown in the following diagram, the communication method by which
the communication with each slave node is repeated, as described from 1)
to 6), is the polling communication. The connection that uses this
communication is the polling connection.
1) The master node transmits the output data.
2) The slave node transmits input data by setting 1) to trigger.
3) The master node transmits the output data.
4) The slave node transmits input data by setting 3) to trigger.
5) The master node transmits the output data.
6) The slave node transmits input data by setting 5) to trigger.
Master node
1)
2)
Slave node
3)
4)
5)
6)
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