Mitsubishi Electric MELSEC-L Series - Page 78

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*1 If the E71 sends an SYN and the connected device returns a RST, Open abnormal detection signal (X18) turns on
immediately and the open process terminates. (Open abnormal end)
*2 If an ACK and a FIN are not returned within the time specified by the TCP end timer value, the E71 forcibly closes the
connection (sends a RST). (Close abnormal end)