Omron NJ101-10 Series, User Manual

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9-4 Replacing Slaves during Communica-
tions
9-4-1 Introduction
You can temporarily stop and start communications with a specified slave and all subsequent slaves
without stopping the entire communications system. This makes it possible to replace slaves during
communications for maintenance, or for replacement when a slave malfunctions.
NJ/NX-series CPU Unit
Slave Slave
EtherCAT communications
instruction
Slave
EC_Disconnect
Slave
New slave
Specified from the Sysmac
Studio or with an EtherCAT
communications instruction.
Sysmac Studio
Replaced.
Slave you
need to replace
Communications continue.
Communications stop.
Precautions for Safe Use
Make sure that the communications distance, number of nodes connected, and method of con-
nection for EtherCAT are within specifications.
Do not connect EtherCAT communications to EtherNet/IP, a standard in-house LAN, or other
networks. An overload may cause the network to fail or malfunction.
Precautions for Correct Use
• An error occurs if you physically disconnect a slave from the network without executing the
EC_DisconnectSlave (Disconnect EtherCAT Slave) instruction.
• An error may occur if the correct node address is not set for a replaced slave and a connec-
tion is made to a different port than the one that was used for the EC_DisconnectSlave (Dis-
connect EtherCAT Slave) instruction.
9 Troubleshooting
9-26
NJ/NX-series CPU Unit Built-in EtherCAT Port User's Manual (W505)