71
Checking Programs Section 2-3
Program error Description Related flags
No END Instruction An END instruction is not present in the
program.
The No END Flag (A29511) turns ON.
Error During Task Execution No task is ready in the cycle.
No program is allocated to a task.
The corresponding interrupt task num-
ber is not present even though the exe-
cution condition for the interrupt task
was met.
The Task Error Flag (29512) turns ON.
Instruction Processing Error (ER Flag
ON) and Stop Operation set for Instruc-
tion Errors in PLC Setup
The wrong data values were provided
in the operand when an attempt was
made to execute an instruction.
The ER Flag turns ON and the Instruc-
tion Processing Error Flag (A29508)
turns ON if Stop Operation set for
Instruction Errors in PLC Setup.
Illegal Access Error (AER Flag ON) and
Stop Operation set for Instruction
Errors in PLC Setup
A read or write was executed for a
parameter area.
A write was executed in a memory area
that is not mounted (see note).
A write was executed in an EM area
specified as EM File Memory.
A write was executed in a read-only
area.
The value specified in an indirect DM/
EM address in BCD mode was not
BCD.
AER Flag turns ON and the Illegal
Access Error Flag (A29510) turns ON if
Stop Operation set for Instruction
Errors in PLC Setup
Indirect DM/EM BCD Error and Stop
Operation set for Instruction Errors in
PLC Setup
The value specified in an indirect DM/
EM address in BCD mode is not BCD.
AER Flag turns ON and the DM/EM
Indirect BCD Error Flag (A29509) turns
ON if Stop Operation set for Instruction
Errors in PLC Setup
Differentiation Address Overflow Error During online editing, more than
131,071 differentiated instructions have
been inserted or deleted.
The Differentiation Overflow Error Flag
(A29513) turns ON.
UM (User Memory) Overflow Error An attempt was made to execute
instruction data stored beyond the last
address in user memory (UM) defined
as program storage area.
The UM (User Memory) Overflow Flag
(A29516) turns ON.
Illegal Instruction Error An attempt was made to execute an
instruction that cannot be executed.
The Illegal Instruction Flag (A29514)
turns ON.
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