9-35
9 Troubleshooting
NJ/NX-series CPU Unit Built-in EtherCAT Port User’s Manual (W505)
9-4 Replacing Slaves during Communications
9
9-4-5 Replacement Procedure
When reconnecting disconnected slaves after replacement or inspection, make sure that the following
conditions are met and then reconnect them. If they are reconnected without meeting following condi-
tions, process data communications with the slaves will not start again, and a network configuration
verification error will occur. If the conditions are met, _EC_EntrySlavTbl will be TRUE.
• Make sure that the slave’s node address is set correctly.
• Make sure that there are no errors in the order that the slaves are connected.
There are no restrictions on the order when reconnecting slaves that are in a daisy chain. For example,
even if slaves (1) to (3) in a configuration such as the one shown in the following figure are discon-
nected, there are no restriction on the reconnection order of slaves (1) to (3). (For example, the slaves
can be reconnected in the order (3), (2), (1) or (1), (3), (2).)
The status of the system-defined variables for disconnected slaves that have been successfully recon-
nected are listed in the following table.
Reconnecting Slaves
System-defined variable name Description Value
_EC_RegSlavTbl[] (Registered Slave
Tab l e)
This variable shows the slaves that are regis-
tered in the network configuration information.
Remains TRUE.
_EC_EntrySlavTbl[] (Network Con-
nected Slave Table)
This variable shows the slaves that are regis-
tered in the network configuration information
and connected to the network.
Shows actual network configu-
ration (changes to FALSE for
disconnection and to TRUE for
connection).
_EC_MBXSlavTbl[] (Message Commu-
nications Enabled Slave Table)
This variable shows the slaves that are regis-
tered in the network configuration information
and able to perform message communications.
The corresponding element
changes to TRUE after the Eth-
erCAT slave is connected from
the Sysmac Studio or with an
instruction
_EC_PDSlavTbl[] (Process Data Com-
municating Slave Table)
This variable shows the slaves that are regis-
tered in the network configuration information
and performing process data communications.
The corresponding element
changes to TRUE after the Eth-
erCAT slave is connected from
the Sysmac Studio or with an
instruction
_EC_DisconnSlavTbl[] (Disconnected
Slave Table)
This variable shows the slaves that are regis-
tered in the network configuration information
and disconnected from the network.
The corresponding element
changes to FALSE after the Eth-
erCAT Slave is disconnected
from the Sysmac Studio or with
an instruction.
Junction Slave
Disconnected
slaves
(3)
(2)
(1)
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