4 Remote I/O
12-50 SmartAXIS Touch User's Manual
Communication with Multiple Remote I/O Slaves
The above timing chart is an example where the communication with remote I/O slave 1 is the fastest and the
communication with remote I/O slave 3 is the slowest.
1. The remote I/O master is able to perform remote I/O communication in END processing and it simultaneously
issues requests to all remote I/O slaves.
2. The time until the response is returned is affected by the state of the network connecting the remote I/O slaves.
Therefore, new requests are only issued for remote I/O slaves that have returned a response.
3. When multiple responses are received in one scan, new requests are issued for all of those simultaneously in END
processing.
Remote I/O
master
Remote I/O
slave 1
1. 2. 3.
Remote I/O
slave 2
Remote I/O
slave 3
END processing
One scan
Remote Communication Speed
The communication speed in remote I/O communication is affected by such factors as the state of the
network line and the communication cable. As a reference for communication speed, when performing
remote I/O communication using a 100BASE-T compatible cable and switching hub, it takes a minimum of
approximately 5 ms after the remote I/O master issues a request until the response from the remote I/O
slave is reflected as inputs.
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