Mitsubishi Electric MELSEC iQ-R Series - Page 1108

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8 BUILT-IN ETHERNET FUNCTION INSTRUCTIONS
8.2 Socket Communications Instructions
Operation error
When completed with an error, an error code is stored in the completion status (s2)+1.
For the error code stored in the completion status (s2)+1, refer to the following.
 MELSEC iQ-R Ethernet User's Manual (Application)
When the receive status signal does not turn on in TCP fixed-length receive mode, the data received as of the
current time can be read with the SP.SOCRDATA instruction to check whether the data sent from the external
device is missing.
Error code
(SD0)
Description
3405H The connection number specified by (s1) is a value other than 1 to 16.