5 Understanding Programming
5-104
CJ2 CPU Unit Software User’s Manual
z Program Errors
Program error Description Related flags
No END Instruction An END instruction is not present in the pro-
gram.
The No END Flag (A295.11) turns
ON.
Error During Task Execu-
tion
No task is ready in the cycle.
No program is allocated to a task.
The corresponding interrupt task number is
not present even though the execution condi-
tion for the interrupt task was met.
The Task Error Flag (295.12) turns
ON.
Instruction Processing
Error (P_ER Flag ON) and
Stop Operation set for
Instruction Errors in PLC
Setup
The wrong data values were provided in the
operand when an attempt was made to exe-
cute an instruction.
The ER Flag turns ON and the
Instruction Processing Error Flag
(A295.08) turns ON if Stop Opera-
tion set for Instruction Errors in
PLC Setup.
Illegal Access Error
(P_AER Flag ON) and Stop
Operation set for Instruc-
tion Errors in PLC Setup
A read or write was executed for a parameter
area.
A read or write was executed for a memory
area that is not mounted.
A read or write was executed for an EM Area
Bank specified as EM File Memory.
A write was executed to 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 (A295.10) 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.
The Access Error Flag will turn
ON. If the Stop CPU on Instruction
Error Check Box is selected in the
PLC Setup, then the Indirect
DM/EM BCD Error Flag (A295.09)
will also turn ON.
Differentiation Address
Overflow Error
During online editing, more than 131,071 dif-
ferentiated instructions have been inserted or
deleted.
The Differentiation Overflow Error
Flag (A295.13) turns ON.
Illegal Instruction Error An attempt was made to execute an instruc-
tion that cannot be executed.
The UM (User Memory) Overflow
Flag (A295.14) turns ON.
UM (User Memory) Over-
flow 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 (A295.15) turns ON.
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