Mitsubishi Electric MELSEC iQ-F FX5 Programming Manual page 750

The following figure shows the timing of the send processing with the SP.SOCSND instruction.
<Sending control method>
Open completion signal
Sequence program
SP.SOCSND instruction
Completion device (d)+0
Completion device (d)+1
For details, refer to MELSEC iQ-F FX5 User's Manual (Ethernet Communication).
Operation error
Error code Description
(SD0/SD8067)
3405H The connection number specified by (s1) is other than 1 to 8.
2820H The device number specified by (s2), (s3), or (d) is outside the range of the number of device points.
2822H Device that cannot be specified is specified.
3582H When an instruction which cannot be used in interruption routine program is used.
10 BUILT-IN ETHERNET FUNCTION INSTRUCTIONS
748
10.2 Socket Communications Function Instructions
Open
processing
ON
OFF
(SD10680.n)
END processing
ON
OFF
ON
OFF
Send
data
END processing END processing
Execute SP.SOCSND instruction
1 scan
When failed
Data send
processing
Data
transmission
*1 Even after completion device
*1
(send)
turns ON, data transmission
may continue.