9 PLC Setup
9-10
CJ2 CPU Unit Software User’s Manual
Precautions for Correct UsePrecautions for Correct Use
The contents of the DM, EM, HR, and AR Areas in the CPU Unit are not backed up to internal
flash memory. The contents of the DM, EM, HR, and AR Areas are retained by the battery when
the power is turned OFF or interrupted. This data may be lost if there is a battery error. Provide
measures in the program using the Battery Error Flag (A402.04) to re-initialize data.
z Detect Duplicated Refreshing Error (Setting Whether to Detect Duplicate
Refresh Errors)
This setting determines whether duplicate refresh errors are detected (default: detect). Duplicate
refresh errors will be detected in the following cases if this parameter is set to the default (ON:
detect).
z Stop CPU on Instruction Error
This setting determines whether operation will be stopped if an instruction execution error occurs
(default: Do not stop). Stopping the CPU Unit for instruction errors is used when debugging the pro-
gram. A program error will be generated as an instruction error if any of the following flags is turned
ON if Stop CPU on Instruction Error is set to stop the CPU Unit.
Parameter Settings Default Function
Related
flags and
words
Detect Dupli-
cated
Refreshing
Error
OFF: Do not
detect
ON: Detect
ON This setting determines whether duplicate refresh
errors are detected. If this setting is set to ON
(detect) and an error is detected, the ERR/ALM indi-
cator on the CPU Unit will flash and the Duplicate
Refresh Error Flag (A402.13) will be turned ON.
CPU Unit operation will continue.
A402.13
(Duplicate
Refresh
Error Flag)
Parameter Settings Default Function Related flags and words
Stop CPU
on Instruc-
tion Error
OFF: Continue
ON: Stop
OFF This setting determines whether
instruction errors (instruction pro-
cessing errors (ER) and illegal
access errors (AER)) are treated
as non-fatal or fatal errors.
A295.08 (Instruction Process-
ing Error Flag), A295.09 (Indi-
rect DM/EM BCD Error Flag,
A295.10 (Illegal Access Error
Flag) (If this setting is set to
OFF, these flags won't be turned
ON even if an instruction error
occurs.)
A295.08
A295.09
A295.10
Indirect DM/EM BCD
Error Flag
Illegal Access Error
Flag
The ER Flag was turned
ON.
OFF: Do not stop
ON: Stop
The contents of a DM/EM
word was not BCD when
BCD was required for
indirect addressing.
Attempted to access part
of memory that is off-limits
from the program.
Instruction
error
Instruction error flag Address Cause
Operation
continues.
Operation
stops.
Instruction Processing
Error Flag
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