Omron NX Series Hardware User Manual page 27

The power supply circuit in the CPU Unit may continue to supply power to 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.
Operation
• 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 be-
fore you restart the Unit.
• If two different function modules are used together, such as when you use EtherNet/IP and Ether-
CAT 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.
• Always confirm safety at the connected equipment before you reset Controller errors with an event
level of partial fault or higher for the EtherCAT Master Function Module.
When the error is reset, all slaves that were in any state other than Operational state due to a Con-
troller error with an event level of partial fault or higher (in which outputs are disabled) will go to Op-
erational state and the outputs will be enabled.
Before you reset all errors or restart a slave, confirm that no Controller errors with an event level of
partial fault have occurred for the EtherCAT Master Function Module.
Designing Tasks
• If the following variables are specified for a condition expression when the execution condition of
event tasks is the same as the condition expression for a variable, event tasks may not be executed
when conditions are met, or event tasks may be executed when conditions are not met.
a) Structure members whose data size is 16 bits or more, except for system-defined variables for
motion control
b) Array elements whose data size is 16 bits or more
Refer to the NJ/NX-series CPU Unit Software User's Manual (Cat. No. W501) for information on
event task execution conditions.
Battery Backup
• If you use the clock data in the user program and turn OFF the power supply for a long time, use a
Battery which is sold separately.
NX-series NX102 CPU Unit Hardware User's Manual (W593)
Precautions for Safe Use
25