Mitsubishi Electronics FX5 ユーザーズマニュアル

APPENDIX
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 

This section describes errors that may occur in the CPU module and actions to be taken for the errors.

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.

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.

There are two types of errors: continuation errors and stop errors.

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.

If a continuation error occurs, the CPU module continues its operation. (The operating state will remain the same.)

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 1

Error location information

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.