Mitsubishi FX3U-ENET, Руководство пользователя

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MELSEC-F
5 COMMUNICATION PROCEDURE
1 If an open request (SYN) received after the normal completion of
an initial processing and before the Ethernet module is placed in
the open acknowledge enabled status, an error is generated, and
the Ethernet module sends a connection forced close (RST).
NOTE
(1) If the settings of the connection need modifying, the modifications should be
done before writing the open instruction to the buffer memory.
(2) Once open processing is executed, an open request cannot be canceled
before the open processing is completed.
Write the close instruction to the buffer memory after the open processing has
been completed.