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Auxiliary Area Appendix C
Note In CJ-series PLCs, the following flags are provided in a special read-only area and can be specified with
the labels given in the table. These flags are not contained in the Auxiliary Area.
Details on Auxiliary Area Operation
A100 to A199: Error Log Area
Flag area Name Label Meaning
Condition Code
Area
Error Flag ER Turns ON when an error occurs in processing an instructions, indi-
cating an error end to the instruction.
Access Error Flag AER Turns ON when an attempt is made to access an illegal area. The
status of this flag is maintain only during the current cycle and only
in the task in which it occurred.
Carry Flag CY Turns ON when there is a carry or borrow in a math operation,
when a bit is shifted into the Carry Flag, etc.
Greater Than Flag > Turns ON when the result of comparing two values is “greater
than,” when a value exceeds a specified range, etc.
Equals Flag = Turns ON when the result of comparing two values is “equals,”
when the result of a math operation is 0, etc.
Less Than Flag < Turns ON when the result of comparing two values is “less than,”
when a value is below a specified range, etc.
Negative Flag N Turns ON when the MSB in the result of a math operation is 1.
Overflow Flag OF Turns ON when the result of a math operation overflows.
Underflow Flag UF Turns ON when the result of a math operation underflows.
Greater Than or Equals
Flag
>= Turns ON when the result of comparing two values is “greater than
or equals.”
Not Equal Flag <> Turns ON when the result of comparing two values is “not equal.”
Less than or Equals Flag <= Turns ON when the result of comparing two values is “less than or
equals.”
Always ON Flag A1 This flag is always ON.
Always OFF Flag A0 This flag is always OFF.
Clock Pulse
Area
0.02-s clock pulse 0.02s Repeatedly turns ON for 0.02 s and OFF for 0.02 s.
0.1-s clock pulse 0.1s Repeatedly turns ON for 0.1 s and OFF for 0.1 s.
0.2-s clock pulse 0.2s Repeatedly turns ON for 0.2 s and OFF for 0.2 s.
1-s clock pulse 1s Repeatedly turns ON for 1 s and OFF for 1 s.
1-min clock pulse 1min Repeatedly turns ON for 1 min and OFF for 1 min.
Error code
Error flag contents
min s
yr
mo
Error code
Error flag contents
min s
yr mo
day
hr
day
hr
Error
record
Error
record
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