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Chapter 7: Computer Link Function
7
(2) Message transfer
The maximum amount of data that can be transferred in one message frame is 1024 bytes (exclud-
ing the header section).
Message transfer data limit
[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