Transferring Programs
• If you use the program transfer from SD Memory Card, set to enter the password for each execution
to prevent an unexpected program transfer.
Replacing Slaves and Units
• If you replace a slave or Unit, refer to the operation manual for the slave or Unit for information on
the data required for individual slaves or Units and redo the necessary settings.
Task Settings
• If a Task Period Exceeded error occurs, shorten the programs to fit in the task period or increase the
setting of the task period.
Motion control
• Use the system-defined variable in the user program to confirm that EtherCAT communications are
established before you attempt to execute motion control instructions. Motion control instructions are
not executed normally if EtherCAT communications are not established.
•
Use the system-defined variables to monitor for errors in communications with the slaves that are
controlled by the motion control function module. Motion control instructions are not executed nor-
mally if an error occur in slave communications.
• Before you start an MC Test Run, make sure that the operation parameters are set correctly.
• Do not download motion control settings during an MC Test Run.
EtherCAT Communications
• If you need to disconnect an EtherCAT slave cable during an operation, specify the disconnection of
the software connection of the EtherCAT slave first.
Apply the
Disable function for those EtherCAT slaves which you plan to replace in the future. If you
need to replace an EtherCAT slave due to a failure or other troubles, be sure to specify disconnect-
ing the software connection.
• If you replace a slave or Unit, refer to the operation manual for the slave or Unit for information on
the data required for individual slaves or Units and redo the necessary settings.
• Set the Servo Drives to stop operation if an error occurs in EtherCAT communications between the
Controller and a Servo Drive.
• Make sure that all of the slaves to be restored are participating in the network before you reset a
Network Configuration Verification Error (Mismatched Slave), Network Configuration Verification
Error (Slave Unconnected), Network Configuration Verification Error (Unnecessary Slave
Connected), Network Configuration Verification Error (Incorrect Ring Wiring), Illegal Slave
Disconnection Detected or Link OFF Error in the EtherCAT Master Function Module. If any slave is
not participating when any of these errors is reset, the EtherCAT Master Function Module may ac-
cess slave with a different node address than the specified node address or the error may not be
reset correctly.
Precautions for Correct Use
34
NX-series NX502 CPU Unit Hardware User's Manual (W629)
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