Mitsubishi Melsec-L Series User Manual page 68

(1) Initial Timing
This setting configures the open timing of the connection where "TCP" (Passive open) or "UDP" has been
selected under "Open System" in the open setting. (
(a) Do not wait for OPEN (Communications impossible at STOP time)
Connections are opened or closed using a program. Communications cannot be performed while the switch on
the CPU module is set to STOP.
(b) Always wait for OPEN (Communication possible at STOP time)
Connections always wait for the open status according to the "Open System" parameter. (This eliminates the
need to open/close connections using a program.
CPU module is set to STOP.
*1 If the program of the CPU module on the own station closes a connection, the station does not enter the OPEN request
wait status after the connection is disconnected.
When remotely controlling the CPU module from a connected device, select "Always wait for OPEN (Communication
possible at STOP time)". If "Do not wait for OPEN (Communications impossible at STOP time)" is selected, the
communication line is closed during remote STOP. After the line is closed, the line cannot be reopened on the CPU module
side, and remote RUN cannot be performed from the connected device.
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Page 67, Section 7.1.4)
*1
) Communications can be performed while the switch on the