Hitachi FL.NET User Manual page 105

5 USER GUIDE
<Transparent reception task>
When a transparent message is received in situations where a transparent reception task is
registered in the FL.NET module, task queuing takes place with the start factor (transparent
reception task's factor) that is set for the task number of the registered task.
If the registered task is not released, however, it does not start.
<Transparent receiving flag>
When a transparent receiving flag is set for the FL.NET module, a 16-word area beginning
with the associated selected address is used as a transparent-type reception flag area.
When the FL.NET module receives a transparent message, the transparent receiving flag
area indicates the node from which the message has been transmitted.
A total of eight cases of transparent message reception buffer are readied.
When a transparent message is received, it is first stored in the reception buffer. When it
is stored, its transmission source node number is checked, and the bit corresponding to the
transmission source node number for the transparent receiving flag area is set.
After the transparent message is fetched by the user, a check is conducted to determine
whether messages having the same transmission source node number as for the message
delivered to the user remain within the transparent message reception buffer.
When there are no more messages having the same transmission source node number, the
bit corresponding to the transmission source node number for the transparent receiving flag
area is reset.
However, when a received transparent message is for a TCD that is related to a function
(preselected task control and preselected subroutine control) uniquely supported by the
FL.NET module, it is not handled as a transparent message.
A transparent receiving task and transparent receiving flag can be set up with the setup tool
named [S10V FL.NET SYSTEM]. For details on the procedure, See "5.5 Operating
Method."
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