Mitsubishi MELSEC iQ-F FX5 series Programming Manual page 389

Operation error
Error code Description
(SD0/SD3067)
2820 The device specified by (s2) exceeds the corresponding device range.
3401 The number of total digits specified by (s1)+1 exceeds 24.
The format specified by (s2) is any value other than "0" or "1".
The total number of digits specified by (s2)+1 is not within the following range in the decimal point format.
When the number of digits of the decimal part is "0": Total number of digits  2
When the number of digits of the decimal part is any value other than "0": Total number of digits  (Number of digits of decimal part + 3)
The total number of digits specified by (s2)+1 is not within the following range in the exponent format.
When the number of digits of the decimal part is "0": Total number of digits  6
When the number of digits of the decimal part is any value other than "0": Total number of digits  (Number of digits of decimal part + +7)
The number of digits of the decimal part specified by (s2)+2 is not within the following range.
In the decimal part format  (Total number of digits - 3)
In the exponent format  (Total number of digits - 7)
When the conversion result exceeds the specified total number of digits
3402 (s1) is not within the following range
 
-126
0, 2 (s1) <
The specified device value is denormalized number, NaN (not a number), or .
3405 The number of digits of the decimal part specified by (s2)+2 is not within the following range.
0 to 7
3406 The device areas that store the character string specified by (d) exceed the corresponding device range.

128
2
7 APPLICATION INSTRUCTION
7.6 Character string operation instruction
7
387