Mitsubishi Electric MELSEC iQ-R Series Programming Manual page 449

Operation error
Error code Description
(SD0)
3401H Invalid data that cannot be converted are input in (s) to (s)+1.
• A value in each place of ASCII code is other than "30H" to "39H" and "41H" to "46H".
6 BASIC INSTRUCTIONS
6.6 Data Conversion Instructions
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