942
Failure Diagnosis Instructions Section 3-28
• Auxiliary Area Words/Flags for both User-defined and System Errors
Precautions N must between 0000 and 01FF. An error will occur and the Error Flag will be
turned ON if N is outside of the specified range.
Examples Generating a Non-fatal Error
When CIO 0.00 is ON in the following example, FAL(006) will generate a non-
fatal error with FAL number 31 and execute the following processes.
1,2,3... 1. The FAL Error Flag (A402.15) will be turned ON.
2. The corresponding Executed FAL Number Flag (A361.14) will be turned
ON.
3. The corresponding error code (411F) will be written to A400.
Note If two or more errors occur at the same time, the error code of the
most serious error (with the highest error code) will be stored in
A400.
4. The error code and the time/date that the error occurred will be written to
the Error Log Area (A100 through A199).
5. The ERR Indicator on the CPU Unit will flash.
6. The ASCII message in D100 to D107 will be displayed at the Programming
Device. (If a message is not required, specify a constant for S.)
Clearing a Particular Non-fatal Error
When CIO 0.01 is ON in the following example, FAL(006) will clear the non-
fatal error with FAL number 31, turn OFF the corresponding Executed FAL
Number Flag (A361.14), and turn OFF the FAL Error Flag (A402.15).
Name Address Operation
Error Log Area A100 to
A199
The Error Log Area contains the error codes
and time/date of occurrence for the most
recent 20 errors, including errors generated
by FAL(006).
Error code A400 When an error occurs its error code is stored
in A400. The error codes for FAL numbers
0001 to 01FF are 4101 to 42FF, respectively.
If two or more errors occur simultaneously,
the error code of the most serious error will
be stored in A400.
MESSAGE
LOW VOLTAGE
4C 4F
57 20
56 4F
4C 54
41 47
45 00
31
M
0.00
D100
M: D100
D101
D102
D103
D104
D105
D106
D107
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