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MELSEC-F
OVERVIEW1
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3) PSH (Push Flag)
When this bit is ON (1), the host that has received this segment sends the
data to the upper application with high priority.
This bit is to be turned ON when the data should be sent to an external
device as soon as possible.
When this bit is OFF (0), the timing when the received data is sent to the
upper application depends on the TCP layer of the receiving side.
4) FIN (Fin Flag)
When this bit is ON (1), it indicates that there is no more data to be sent
from the segment source and that the send source wants to disconnect.
However, data can be received from the external device.
The connection is on until the segment whose FIN bit is ON is received
from the external device.
5) RST (Reset Flag)
When this bit is ON (1), the host from which the segment has sent
disconnects unilaterally (forcibly).
Disconnection by this method is used when an unrecoverable error with
the normal method has occurred or when the host has been restored after
being down.
6) URG (Urgent Flag)
When this bit is ON (1), it indicates that this data segment includes the
emergency data flag.