Mitsubishi Electric MELSEC iQ-R Series Programming Manual page 1097

Operation error
Error code Description
(SD0)
2820H The amount of data received exceeds the relevant setting area in the device/label memory in the receive data storage device.
3405H The connection number specified by (s) is a value other than 1 to 16.
To avoid receiving too much amount of data, the SP.SOCRMODE instruction can be used to set the size of
receive data to limit the amount of receive data.
8 BUILT-IN ETHERNET FUNCTION INSTRUCTIONS
8.2 Socket Communications Instructions
8
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