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(2) Message transfer
The maximum amount of data that can be transferred in one message frame is 1024 bytes (exclud-
ing the header section).
[5] Transfer cycle
In the cyclic transfer operation, the JW-50FL refreshes the common memory almost constantly. The
JW-50FL controls the transfer of messages so that the refresh interval of the common memory does not
exceed the allowable refresh cycle interval for a single message transfer.
Each node always monitors the messages being transferred throughout the network, waiting to receive
a token addressed to itself. If no message transferred by the network within this cycle, the refresh cycle
interval is increased to 120 % of its current value.
Due to the monitoring process above, the refresh cycle interval is automatically determined by the
number of nodes active on the network.
Message frame
1024 byes
Message transfer data limit
7-11
Chapter 7: Computer Link Function
7
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