Precautions for Safe Use
20
NX-series NX1P2 CPU Unit Hardware User’s Manual (W578)
• If you change the fail-soft operation setting, the output status when the error occurs may also change.
Confirm safety before you change the setting.
• If you use fail-soft operation, write programming to determine whether Unit I/O data is valid. Without
such programming, the user program cannot distinguish between Units for which I/O refreshing is
continued and Units for which I/O refreshing is stopped.
• Never turn OFF the power supply to the Controller when the BUSY indicator is flashing. While the
BUSY indicator is lit, the user program and settings in the CPU Unit are being backed up in the
built-in non-volatile memory. This data will not be backed up correctly if the power supply is turned
OFF. Also, a major fault level Controller error will occur the next time you start operation, and opera-
tion will stop.
• Do not turn OFF the power supply or remove the SD Memory Card while SD Memory Card access is
in progress (i.e., while the SD BUSY indicator flashes). Data may become corrupted, and the Control-
ler will not operate correctly if it uses corrupted data. To remove the SD Memory Card from the CPU
Unit while the power supply is ON, press the SD Memory Card power supply switch and wait for the
SD BUSY indicator and SD PWR indicator to turn OFF before you remove the SD Memory Card.
• Do not disconnect the cable or turn OFF the power supply to the Controller when downloading data
or the user program from Support Software.
• Always turn OFF the power supply to the Controller before you attempt any of the following.
a) Mounting or removing the Units
b) Assembling the Units
c) Setting DIP switches or rotary switches
d) Connecting cables or wiring the system
e) Connecting or disconnecting the terminal blocks or connectors
f) Mounting or removing the Option Boards
The Power Supply Unit may continue to supply power to the rest of the Controller for a few seconds
after the power supply turns OFF. The POWER indicator is lit during this time. Confirm that the
POWER indicator is not lit before you perform any of the above.
• Confirm that no adverse effect will occur in the system before you attempt any of the following.
a) Changing the operating mode of the CPU Unit (including changing the setting of the Startup
Mode)
b) Changing the user program or settings
c) Changing set values or present values
d) Forced refreshing
e) Starting the CPU Unit with the battery exhausted
f) Restarting a slave or Unit after you change any settings
g) Transferring a backup file on the SD Memory Card
• After you change any slave or Unit settings, carefully check the safety of the controlled system before
you restart the Unit.
• If two different function modules are used together, such as when you use EtherNet/IP and EtherCAT
slaves, take suitable measures in the user program and external controls to ensure that safety is
maintained in the controlled system if one of the function modules stops. The relevant outputs will
behave according to the slave or Unit specifications if a partial fault level error occurs in one of the
function modules.
Actual Operation
Turning OFF the Power Supply
Operation
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