6
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101
CHAPTER6 FUNCTIONS
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6.17 Self-d
iagnostic F
unction
: 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: This option can be set "not checked" (set "checked" by default) with the parameter setting of GX Developer. Also, this option is not
checked while SM251 is on.
*3: This option can be set "not checked" (set "checked" by default) with the parameter setting of GX Developer.
*4: In multiple CPU systems, when the serial numbers of all the CPU modules (first five digits) are "07032" or later, this error is detected from
the CPU No.1 only.
*5: The CPU module function version B or later supports the detection of this error.
*6: Since this diagnostics indicates 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.
When the Redundant CPU is used, the details of an error occurred in the other system are stored in the special relays
(SM1610 to SM1626) and special registers (SD1610 to SD1636) except when:
• the other system is during off, reset, or hardware failure,
• "WDT ERROR" (error code: 5000, 5001) is detected, or
• tracking cable has an error (not connected, disconnection, or failure).
Table6.27 Self-diagnostics list (continued)
Diagnostics
Error
message
Diagnostic timing
CPU
module
status
LED status
Basic
model
QCPU
High
Performance
model QCPU
Process
CPU
Redundant
CPU
RUN
ERR.
Redunda
nt system
error
Memory copy
function
execution
MEM.COPY
EXE.
• Execution of the memory
copy function
Continue
On
On
Tracking
setting
parameter
error
TRK.PARA.
ERROR
• Power-on/reset
Stop
Off
Flashing
Multiple CPU
system not
configurable
CPU LAY
ERROR
• Power-on/reset
Stop
Off
Flashing
Multiple
CPU
system
error
Another CPU
major error
MULTI CPU
DOWN
• Always
• Power-on/reset
Stop
Off
Flashing
Multiple CPU
systems
execution
error
MULTI
EXE.ERRO
R
• Power-on/reset
Stop
Off
Flashing
Multiple CPU
systems
consistency
error
CPU
LAY.ERRO
R
• Power-on/reset
Stop
Off
Flashing
Another CPU
minor error
MULTI CPU
ERROR
• Always
Continue
On
On
Annunciator check
F****
• Execution of an
instruction
Continue
On
USER
LED turns
on.
CHK instruction check
<CHK>ERR
***-***
• Execution of an
instruction
Continue
On
USER
LED turns
on.
Boot OK
BOOT OK
• Power-on/reset
Stop
Off
Flashing