Omron NSJ CONTROLLERS - 03-2008 Operation Manual page 25

Application Precautions
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• Do not perform the following operations while the uploading or download-
ing screen data or system programs. The screen data or system program
may be corrupted.
• Turning OFF the power supply to the NSJ Controller
• Pressing the reset switch on the Display Section
• Confirm that no adverse effect will occur in the system before attempting
any of the following. Not doing so may result in unexpected operation.
• Changing the operating mode of the NSJ Controller (including the set-
ting of the startup operating mode).
• Force-setting/force-resetting any bit in memory.
• Changing the present value of any word or any set value in memory.
• Use the CX-Programmer (programming software that runs on Windows) if
you need to program more than one task.
• When creating an AUTOEXEC.IOM file from a Programming Device (CX-
Programmer) to automatically transfer data at startup, set the first write
address to D20000 and be sure that the size of data written does not
exceed the size of the DM Area. When the data file is read from the Mem-
ory Card at startup, data will be written to the Controller Section starting
at D20000 even if another address was set when the AUTOEXEC.IOM file
was created. Also, if the DM Area is exceeded (which is possible when
the CX-Programmer is used), the remaining data will be written to the EM
Area.
• Always turn ON power to the NSJ Controller before turning ON power to
the control system. If the NSJ Controller power supply is turned ON after
the control power supply, temporary errors may result in control system
signals because the output terminals on DC Output Units and other Units
will momentarily turn ON when power is turned ON to the NSJ Controller.
• Fail-safe measures must be taken by the customer external to the NSJ
Controller to ensure safety in the event that outputs from Output Units
remain ON as a result of internal circuit failures, which can occur in relays,
transistors, and other elements.
• If the I/O Hold Bit is turned ON, the outputs from the NSJ Controller will
not be turned OFF and will maintain their previous status when the NSJ
Controller is switched from RUN or MONITOR mode to PROGRAM mode.
Make sure that the external loads will not produce dangerous conditions
when this occurs. (When operation stops for a fatal error, including those
produced with the FALS(007) instruction, all outputs from Output Unit will
be turned OFF and only the internal output status will be maintained.)
• The contents of the DM, EM, and HR Areas in the Controller Section are
backed up by a Battery. If the Battery voltage drops, this data may be lost.
Provide countermeasures in the program using the Battery Error Flag
(A40204) to re-initialize data or take other actions if the Battery voltage
drops.
• Do not perform the following operations while a Memory Card is being
accessed. In the worst case, the Memory Card may be rendered unus-
able.
• Turning OFF the power supply to the NSJ Controller
• Pressing the reset switch on the Display Section
• Always following the specified procedure when removing the Memory
Card. In the worst case, the Memory Card may be rendered unusable if it
is removed while being accessed.
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