
3.MESSAGE TRANSMISSION DESCRIPTION B-63434EN/02
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CAUTION
Ensure that while the transmission request/response
flag is set to 0001h, the user program does not rewrite
the data in this interface area. Otherwise, message
transmission may not be terminated normally.
NOTE
1 When a service is terminated normally, 8000h is
returned to this flag. If a value other than 8000h is
returned, check the value, and resolve the problem.
See Table 3-3 for the error codes returned from the
system.
2 After a message transmission request is made, this
interface does not allow the next transmission
request to be made until a response message is
received or an error occurs. So, if a response
message cannot be received for a cause on the
server, the next message transmission request
cannot be made until the power is turned off. In
such a case, the cancel flag allows the system to exit
from the response message wait state and wait for
the next message transmission request. The
purpose of this cancellation is just to allow the
system to accept the next message transmission
request. This cancellation is not intended to cancel
message transmission with the FL-net function.
(The FL-net function does not have a function for
canceling message transmission.) This means that
when this cancellation function is used, the response
message for the previous message request may be
treated as a response to the next message request
by mistake.