6
FUNCTIONS
6.7 Self-diagnostics Function
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(6) List of self-diagnostics
The error messages in the "Error message" column in the table can be checked on
the screen displayed by selecting [Diagnostics] [PLC Diagnostics] in GX
Developer.
(Continued to the next page)
Table6.11 List of self-diagnostics
No.
Detailed item/
Diagnostics subject
Diagnostics description
Diagnostics
timing
Error occurring when error is detected
Error code
Error message
1
RAM diagnostics
Checks that the CPU module internal memory
is not corrupted.?
• At power ON
• At reset
1131,1132,1133,
1136,1137
RAM ERROR
• Always
1141,1142,1143,
1146
2
F/W diagnostics
Checks that the firmware stored in the ROM is
not corrupted?
• At power ON
• At reset
• During execution
of the END
instruction
8060
INCORRECT FIRMWARE
3
Operation circuit
diagnostics
Checks that the operation circuit, which
performs sequence program operations,
operates correctly?
• At power ON
• At reset
• During execution
of the END
instruction
1210
OPERATION CIRCUIT ERROR
4
Program verify
Checks that files stored in the program memory
are not corrupted?
• At power ON
• At reset
8031
INCORRECT FILE
• During execution
of the END
instruction
8032
5
Output data verify
Checks that the operation results output from
the CPU A and B match?
• During execution
of the END
instruction
8050
SAFETY OUTPUT VERIFY
ERROR
6
Time monitoring
Checks that the CPU A and B have the same
OS execution status?
• Always
8020
CPU A & B CAN'T BE
SYNCHRONIZED
• During execution
of the END
instruction
8021
7
Microcomputer diagnostics
Checks that registers used in the CPU module
operate correctly.
• At power ON
• At reset
• During execution
of the END
instruction
8000
INTERNAL REGISTER
ERROR
8010
INTERNAL BUS ERROR
8
Power supply voltage
monitoring
Checks that the CPU module operates at a
voltage within the operation guaranteed range.
• Always
8080
POWER SUPPLY ERROR
9
Power supply voltage
monitoring circuit
diagnostics
Checks that the power supply voltage
monitoring circuit operates correctly?
• During execution
of the END
instruction
8090
VOLTAGE DIAGNOSIS
ERROR
10
Clock stop detection
Checks that clock input to the CPU module
internal circuit is not stopped?
• Always
8120
WDT CLOCK CHECK ERROR
11
CPU module OS
Checks that the main CPU operates normally
without detecting runaway?
• Always
1000, 1006
MAIN CPU DOWN
12
CPU module hardware
Checks that the following hardware of the CPU
module operates correctly?
• Main CPU
• Clock element
• RUN/STOP/RESET switch
• Always
1001, 1002,
1003, 1004
MAIN CPU DOWN
13
Power supply module
Checks that the power supply module operates
normally?
• Always
1009
MAIN CPU DOWN
14
Program
Checks that the END instruction is executed at
the end of the user program?
• During execution
of the END
instruction
1010
END NOT EXECUTE
15
CPU module, base unit,
CC-Link Safety master
module, network module
Checks that no invalid interrupt occurs within
the CC-Link Safety master module, network
module, base unit or CPU module?
• At interrupt
occurrence
1311
I/O INTERRUPT ERROR
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