21
Precautions for Safe Use
NX-series NX1P2 CPU Unit Hardware User’s Manual (W578)
• 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 Oper-
ational 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.
• 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.
The Battery is not mounted when the product is at factory setting. The clock data is retained by the
built-in capacitor.
The capacitor is charged while the power is supplied and discharged while the power is not supplied.
If the power OFF time rate is high, the clock data is initialized and malfunctions may occur in the pro-
gram for which the clock data is used.
• If you use the Battery, connect the Sysmac Studio and set the Battery-related error detection to
Use. The Battery-related error detection is set to Do not use at the factory setting because the
Battery is not built in. If the Battery-related error detection is set to Do not use, an error cannot be
detected when the Battery is exhausted and malfunctions may occur in the program for which the
clock data is used.
• Forced refreshing ignores the results of user program execution and refreshes I/O with the specified
values. If forced refreshing is used for inputs for which I/O refreshing is not supported, the inputs will
first take the specified values, but they will then be overwritten by the user program. Be careful that
this operation differs from the force-set/reset functionality of the CJ/CP-series PLCs.
• You cannot upload or download information for forced refreshing with the Sysmac Studio.
After downloading data that contains forced refreshing, change to RUN mode and then use the Sys-
mac Studio to perform the operation for forced refreshing.
Depending on the difference in the forced status, the control system may operate unexpectedly.
• Do not specify the same address for the AT specification for more than one variable.
Doing so would allow the same entity to be accessed with different variable names, which would
make the user program more difficult to understand and possibly cause programming mistakes.
• When you use data link communications, check the error information that is given in _ErrSta (Control-
ler Error Status) to make sure that no error has occurred in the source device. Create a user program
that uses reception data only when there is no error in the source device. If there is an error in the
source device, the data for the data link may contain incorrect values.
• Unexpected operation may result if inappropriate data link tables are set. Even if appropriate data link
tables have been set, confirm that the controlled system will not be adversely affected before you
transfer the data link tables. The data links start automatically after the data link tables are trans-
ferred.
• Make sure to use the communications distance, number of nodes connected, and method of connec-
tion for EtherNet/IP within specifications.
Do not connect EtherNet/IP communications to EtherCAT or other networks. An overload may cause
the network to fail or malfunction.
Battery Backup
Debugging
General Communications
EtherNet/IP Communications
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