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MELSEC-F
SETTINGS AND PROCEDURES PRIOR TO OPERATION4
4 - 12
(4) Initial Timing (BFM#24 b8)
(a) Select the timing to open connections for which TCP-Passive open or UDP
open are selected with the "Open settings" parameter (*1).
*1 For more details on the open settings, see Section 5.5 "Open Settings".
*2 If the sequence program of the local station's PLC executes the close processing, the station is not placed
in the OPEN request wait status after the connection is shut off.
(b) In the following cases, open/close processing is required with instructions
written to the buffer memory (BFM #1602 to 1609).
• When "Do not wait for OPEN" is selected in the initial timing settings.
• If the "Open settings" are not performed for a connection.
• If "TCP-Active" is selected in the "Open settings" for a connection.
For detail on the open/close processing, see Section 5.6 "Open Processing/
Close Processing of the Connection".
Name of setting Description of setting
Do not wait for OPEN
(Communication
impossible after STOP)
• Execute open/close processing using a sequence program.
• Communication cannot be performed while the PLC is in the STOP status.
Always wait for OPEN
(Communication possible
after STOP)
• Passive open and UDP open connections always wait for open according to the
parameter settings (a sequence program for open/close processing is not required)
(*2)
.
• Communication can be performed while the PLC is in the STOP status.