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I
4. A2CCPU
- - - - - - - - - - - - - - - - - - - - MELSEC·A
Table 4.8 Self-diagnosis List
Error
A2C
RUN
ERROR
Diagnosis Contents
Code
Diagnosing Timing
Status
LED
LED
(09008)
Status
Status
Instruction code
10
• At an execution of each individual
check
instruction
• When power is turned ON or A2C
Parameter setting
is reset.
11
check
• When A2C status is changed from
STOP/PAUSE to RUN.
Memory
• When A2C status is changed from
error
No END instruction
12
STOP/PAUSE to RUN.
• When following instructions are
executed:
Instruction not
[CJj, [SCJ], [JMPj, [CALL(P)],
Lit
executable
13
[FOR-NEXT]
Stop
Flash
• When A2C status is changed from
STOP/PAUSE to RUN.
RAM check
20
• When power is turned ON or A2C
is reset.
Operation circuit
21
• When power is turned ON or A2C
check
is reset.
CPU error
Watchdog timer error
22
• At an execution of EN 0 instruction
END
instruction not
24
• At an execution of END instruction
executed
Infinite loop execution
25
• Always
-
• At END instruction execution
% 7
I/O module verify
*1
31
When M9084 or M9094 is turned
ON, this check is not executed.
I/O error
Lit
• At END instruction execution
Fuse blown
* 1
32
When M9084 or M9094 is turned
Run
Lit
ON, this check is not executed.
Battery
Low battery voltage
*2
70
• Always
Run
Lit
• At an execution of each individual
IX
~
Lit
Operation check error
*3
50
instruction
Run
Lit
IREMARKSI
(1) If two status are given in the "A2C Status" and "RUN LED Status" columns, status setting
can be selected by the setting on a peripheral device.
(2)
*1 •••
Only a remote I/O station module using the AJ72P25/R25 data link modules can verify
I/O modules.
(3)
*2 ...
Low battery voltage state can be detected by reading the set/reset state of the low
battery flag (M9006) or low battery latch flag (M9007).
For the low battery flag and low battery latch flag, see Appendix 2.
(4)
*3 ...
The operation check error can be detected by reading the set/reset status of the
operation error flag (M9010, M9011). By reading the error step registers (09010,
09011), the number of the step causing the operation error can be confirmed.
For the operation error flag, see Appendix 2 and for the error step register, see
Appendix 3.
4-43

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