9-27
9 Troubleshooting
NJ/NX-series CPU Unit Built-in EtherCAT Port User’s Manual (W505)
9-4 Replacing Slaves during Communications
9
9-4-1 Introduction
9-4 Replacing Slaves during
Communications
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.
Precautions for Correct UsePrecautions for Correct Use
• A Process Data Communications Error occurs if you physically disconnect a slave from the
network without executing the disconnection instruction.
• A Network Configuration Verification Error occurs if the correct node address is not set for a
slave that was replaced with the disconnection instruction and a connection is made to a dif-
ferent port than the one that was used for the disconnection instruction.
9-4-1 Introduction
NJ/NX-series CPU Unit
Slave
Slave
EtherCAT communications
instruction
Slave
EC_Disconnect
Slave
New slave
Specified from the Sysmac Studio or
with an instruction for EtherCAT
communications.
Sysmac Studio
Replaced.
Slave you
need to replace
Communications continue.
Communications stop.
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