6
FUNCTIONS
6.17 Self-diagnostics Function
6 - 139
1
Overview
2
Performance
Specification
3
Sequence Program
Configuration and
Execution Conditions
4
I/O Nunber Assignment
5
Memories and Files
Handled by CPU Module
6
Functions
7
Communication using
built-in Ethernet ports of
CPU module
8
Communication with
Intelligent Function
Module
: Self-diagnostics is performed, : Self-diagnostics is not performed
* 1 : The operation status can be changed to "Continue" with the parameter setting in GX Developer.
(The default is set to "Stop".)
* 2 : The check item can be set to "Not execute (without a checkmark in the checkbox)" with the
parameter setting in GX Developer. (The default is set to "Execute (with a checkmark in the
checkbox)".) Besides, the check is not executed when SM251 is ON.
* 3 : The check can be set to "Not execute (without a checkmark in the checkbox)" with the parameter
setting in GX Developer. (The default is set to "Execute (with a checkmark in the checkbox)".)
* 4 : In a multiple CPU system configuration, it is detected only by CPU module of CPU No.1 when
serial No. (first five digits) of all CPU modules is "07032" or later.
* 5 : The CPU module whose function version is B or later is required.
* 6 : Operation errors which occur when device range is checked for index-modified devices are
included.
* 7 : Since this diagnostics indicates the CPU module status, the error message is not displayed in the
"Current error" field on the PLC diagnostics screen of GX Developer.
This error is displayed in the error history field only.
* 8 : Only the Built-in Ethernet port QCPU is targeted.
* 9 : CPU modules whose serial number (first five digits) is "10042" or later are targeted.
POINT
In the case of the Redundant CPU, the information of the error that occurred in the
other system is stored into the special relay (SM1610 to 1626) and special
register (SD1610 to 1636).
In any of the following cases, the other system error information is not stored.
• The other system is powered OFF/reset or has developed a hardware
failure.
• A watchdog timer error (error code: 5000, 5001) has occurred.
• Tracking cable fault (not installed, disconnected, failed, etc.)
Table6.35 Self-diagnostics list (Continued)
Diagnosics Error message Diagnostics timing
CPU
module
status
LED status CPU module
RUN ERR. 1) 2) 3) 4)
5)
Multiple
CPU
error
Multiple CPU
consistency error
CPU
LAY.ERROR
• When the CPU
module is
powered on/reset
Stop OFF Flash
Other CPU minor
error
MULTI CPU
ERROR
• Always Continue ON ON
File diagnostics check
INCORRECT
FILE
• When the CPU
module is
powered on/reset
• When switched
from STOP to
RUN
• At PLC writing
Stop OFF OFF
Annunciator check F****
• When an
instruction is
executed
Continue ON
USER LED
ON
CHK Instruction check
<CHK>ERR***-
***
• When an
instruction is
executed
Continue ON
USER LED
ON
BOOT OK BOOT OK
• When the CPU
module is
powered on/reset
Stop OFF Flash
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