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APPENDIX
Appendix 3 Error Code
Appendix 3 Error Code
The CPU module stores error code in special register (SD) upon detection of an error using the self-diagnostics function. The
error details and cause can be identified by checking the error code. The error code can be checked in either of the following
ways.
• Module diagnostics of engineering tool (MELSEC iQ-F FX5 User's Manual (Startup))
• Special register (SD0 (latest self-diagnostics error code), SD10 to SD25 (self-diagnostics error code)) (Page 240
Special Register List)
This section describes errors that may occur in the CPU module and actions to be taken for the errors.
Error code system
All error codes are given in hexadecimal format (4 digits) (16-bit unsigned integer). The following table lists the error detection
type and the error code ranges.
Detailed information
Upon detection of error through self-diagnostics function, the detailed information of the error cause is stored all together. The
following detailed information is added to each error code (up to two types of information are stored for each error code. The
types differ depending on error code.) Detailed information 1 to 2 of the latest error code(s) can be checked with special
register (SD).
*1 The step No, which is displayed in the program position information, is the step No that is counted from the head of the file. It might be
sometimes different from the step No of the program which is displayed in error jump of engineering tool.
Operation when an error occurs
There are two types of errors: continuation errors and stop errors.
Stop error
If a stop error occurs, the CPU module stops its operation and the operating state will be in STOP. Modules can communicate
with the CPU module even after a stop error occurs in the CPU module.
Continuation error
If a continuation error occurs, the CPU module continues its operation. (The operating state will remain the same.)
Error detection type Range Description
Detection by the self-diagnostics function of each module 0001H to 3FFFH Error code specific to each module, such as self-diagnostics errors
Detected during communication between CPU modules 4000H to 4FFFH CPU module error
7000H to 7FFFH MELSEC iQ-F FX5 User's Manual (Serial Communication)
MELSEC iQ-F FX5 User's Manual (MODBUS Communication)
C000H to CFFFH MELSEC iQ-F FX5 User's Manual (Ethernet Communication)
Detailed information Item Description
Detailed information 1 Error location information
*1
Information on the location in a program
Drive/File information Information on drive names and file names
Parameter information The information for the parameter, such as parameter storage location and parameter
type, is indicated.
System configuration information The information for the system configuration, such as I/O No is indicated.
Frequency information This section describes the information for frequency such as the write frequency into
memory.
Time information The information for the time is indicated.
Detailed information 2 Drive/File information Information on drive names and file names
Annunciator information Information about annunciators
Parameter information The information for the parameter, such as parameter storage location and parameter
type, is indicated.
System configuration information The information for the system configuration, such as I/O No is indicated.