Hitachi FL.NET User Manual page 102

(b) Message transmission request by mathematical/logical function
A mathematical/logical function is called from a ladder program to issue a message
request to the FL.NET module for data exchange purposes. The mathematical/logical
function for the main module/submodule is available. The parameter specified at
mathematical/logical function startup dictates the message processing to be requested.
For the procedure for registering the FL.NET module mathematical/logical function, See
"5.5 Operating Method."
Ladder program
As is the case with the C mode handler, the mathematical/logical function merely issues a
request to the FL.NET module and then terminates the processing.
After receipt of a request, the FL.NET module sets the "user request processing in
progress" bit in the self-node status flag, and resets it at the end of the processing.
To verify the end of the message processing after issuance, check the self-node status flag.
The status indicates the end of the processing.
After a request is issued by the mathematical/logical function, do not make another
message request until the "user request processing in progress" bit is resets. If any
message request is issued before the bit is reset, it is not processed because another
message is being processed (the "message processing already in progress" error code is set
at an error code storage address).
After the "user request processing in progress" bit is reset, enter the status prevailing after
the end of the processing at an error code storage address specified at
mathematical/logical function startup.
FLCM
FW000
F
FLCS
DW000
F
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5 USER GUIDE