xxii
Safety Precautions
3
!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 to
another node or changing contents of the I/O memory area. Doing either of
these without confirming safety may result in injury.
!Caution
When setting Units using the IORD or IOWR instructions, check the operation
of the ladder program and data completely before using them in actual opera-
tion. Incorrect settings may cause the Unit to stop operating or may result in
unexpected operation of connected devices.
!Caution
The NSJ Controller automatically backs up the user program and parameter
data to flash memory when these are written to the Controller Section. I/O
memory (including the DM, EM, and HR Areas), however, is not written to
flash memory. The DM, EM, and HR Areas can be held during power interrup-
tions 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
HR Areas are used to control external outputs, prevent inappropriate outputs
from being made whenever the Battery Error Flag (A40204) is ON. Areas
such as the DM, EM, and HR Areas, the contents of which can be held during
power interrupts, is backed up by a battery. If a battery error occurs, the con-
tents of the areas that are set to be held may not be accurate even though a
memory error will not occur to stop operation. If necessary for the safety of the
system, take appropriate measures in the ladder program whenever the Bat-
tery Error Flag (A40204) turns ON, such as resetting the data in these areas.
!Caution
When installing the NSJ Controller on the door of a control panel or any other
moving object, be sure that all cables are long enough so that excessive force
is not applied to cables and connectors.
!Caution
Tighten the power supply terminal block screws to the torque specified in this
manual. Loose screws may result in fire or malfunction.
!Caution
Wire the polarity of the power supply correctly when using a DC power supply.
Reversing the polarity may cause abnormal operation.
!Caution
Do not touch a Power Supply Unit while power is being supplied or immedi-
ately after turning OFF the power supply. The Unit may be hot and may cause
burns.
!Caution
When connecting a Programming Device or other personal computer to a NSJ
Controller to which a non-insulated Power Supply Unit (e.g., CJ1W-PD022) is
mounted, either ground the 0 V side of the external power supply or do not
ground the external power supply at all ground. A short-circuit will occur in the
external power supply if incorrect grounding methods are used. Never ground
the 24 V side, as shown below.
