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Auxiliary Area Appendix C
A295 A29508 Instruction
Processing
Error Flag
This flag and the Error Flag (ER) will be turned ON
when an instruction processing error has occurred
and the PLC Setup has been set to stop operation for
an instruction error. CPU Unit operation will stop and
the ERR/ALM indicator will light when this flag goes
ON.
1: Error Flag ON
0: Error Flag OFF
Cleared Cleared PLC Setup (Operation
when instruction error
has occurred)
The task number where
the error is stored in
A294 and the program
address is stored in
A298 and A299.
A29509 Indirect DM/
EM BCD Error
Flag
This flag and the Access Error Flag (AER) will be
turned ON when an indirect DM/EM BCD error has
occurred and the PLC Setup has been set to stop
operation an indirect DM/EM BCD error. (This error
occurs when the content of an indirectly addressed
DM or EM word is not BCD although BCD mode has
been selected.) CPU Unit operation will stop and the
ERR/ALM indicator will light when this flag goes ON.
1: Not BCD
0: Normal
Cleared Cleared
A29510 Illegal Access
Error Flag
This flag and the Access Error Flag (AER) will be
turned ON when an illegal access error has occurred
and the PLC Setup has been set to stop operation an
illegal access error. (This error occurs when a region
of memory is access illegally.) CPU Unit operation
will stop and the ERR/ALM indicator will light when
this flag goes ON.
The following operations are considered illegal
access:
1) Reading/writing the system area
2) Reading/writing EM File Memory
3) Writing to a write-protected area
4) Indirect DM/EM BCD error (in BCD mode)
1: Illegal access occurred
0: Normal condition
Cleared Cleared
A295 A29511 No END Error
Flag
ON when there isn’t an END(001) instruction in each
program within a task.
CPU Unit operation will stop and the ERR/ALM indi-
cator will light when this flag goes ON.
1: No END
0: Normal condition
Cleared Cleared The task number where
the error is stored in
A294 and the program
address is stored in
A298 and A299.
A29512 Task Error
Flag
ON when a task error has occurred. The following
conditions generate a task error.
There isn’t even one regular task that is executable
(started).
There isn’t a program allocated to the task.
1: Error
0: Normal
Cleared Cleared
A29513 Differentiation
Overflow Error
Flag
The allowed value for Differentiation Flags which cor-
respond to differentiation instructions has been
exceeded. CPU Unit operation will stop and the ERR/
ALM indicator will light when this flag goes ON.
1: Error
0: Normal
Cleared Cleared
A29514 Illegal Instruc-
tion Error Flag
ON when a program that cannot be executed has
been stored. CPU Unit operation will stop and the
ERR/ALM indicator will light when this flag goes ON.
1: Error
0: Normal
Cleared Cleared
A29515 UM Overflow
Error Flag
ON when the last address in UM (User Memory) has
been exceeded. CPU Unit operation will stop and the
ERR/ALM indicator will light when this flag goes ON.
1: Error
0: Normal
Cleared Cleared
Address Name Function Status
after
mode
change
Status
at star-
tup
Write timing/
Related flags,
settings
Words Bits
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