PRECAUTIONS
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CS/CJ/NSJ Series Instructions Reference Manual (W474)
!Caution Confirm safety before transferring data files stored in the file memory (Mem-
ory Card or EM file memory) to the I/O area (CIO) of the CPU Unit using a
peripheral tool. Otherwise, the devices connected to the Output Unit may mal-
function regardless of the operating mode of the CPU Unit.
!Caution Fail-safe measures must be taken by the customer to ensure safety in the
event of incorrect, missing, or abnormal signals caused by broken signal lines,
momentary power interruptions, or other causes. Serious accidents may
result from abnormal operation if proper measures are not provided.
!Caution Execute online edit only after confirming that no adverse effects will be
caused by extending the cycle time. Otherwise, the input signals may not be
readable.
!Caution Confirm safety at the destination node before transferring a program, PLC
Setup, I/O tables, I/O memory contents, or parameters to another node or
changing contents of the any of these items. Transferring or changing data
can result in unexpected system operation.
!Caution The CJ2 CPU Units automatically back up the user program and parameter
data to flash memory when these are written to the CPU Unit. I/O memory
(including the DM, EM, and HR Areas), however, is not written to flash mem-
ory. The DM, EM, and HR Areas can be held during power interruptions with a
battery. If there is a battery error, the contents of these areas may not be
accurate after a power interruption. If the contents of the DM, EM, and Hold-
ing Areas are used to control external outputs, prevent inappropriate outputs
from being made whenever the Battery Error Flag (A402.04) is ON.
!Caution Tighten the terminal screws on the AC Power Supply Unit to the torque speci-
fied in the operation manual. The loose screws may result in burning or mal-
function.
!Caution Do not touch the Power Supply Unit when power is being supplied or immedi-
ately after the power supply is turned OFF. The Power Supply Unit will be hot
and you may be burned.
!Caution Be careful when connecting personal computers or other peripheral devices
to a PLC to which is mounted a non-insulated Unit (CS1W-CLK12/52(-V1) or
CS1W-ETN01) connected to an external power supply. A short-circuit will be
created if the 24 V side of the external power supply is grounded and the 0 V
side of the peripheral device is grounded. When connecting a peripheral
device to this type of PLC, either ground the 0 V side of the external power
supply or do not ground the external power supply at all.
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