Mitsubishi QD51 Programming Manual page 661

APPENDIX
Appendix 4.4.2 System error code table
App - 16
An error code at a system error occurrence is expressed as a 4-digit hexadecimal
number. The code is read as follows:
System error
Indicates the task number
where an error occurred.
The error code given by the ERR function is a decimal number.
Refer to the error code table after converting this number to
hexadecimal using the HEX$ function.
Indicates the
error code.
MELSEC-Q
App - 16