Check if the master side can accept communication when the slave is connected to the master.
For details about the setting screen, refer to the setting guide.
M.25.3.1 Peripheral Settings - Master diagnostics
Go to offline mode and touch [Peripheral Settings] on the item changeover switch.
[Peripheral Settings] screen opens. Touch [I/O Driver] and then [CANopen Driver].
[I/O Driver] screen opens. Touch [CANopen Master Diagnostics].
[CANopen Master Diagnostics] screen opens. Check the [Network State] and [Communication Status]. (Example, Network State=[OPERATIONAL], Communication Status=[Network operational], [Master operational] indicates that the master is operating normally.)
For details on [Network State] and [Communication status], refer to the following.
M.25.3.1 Peripheral Settings - Master diagnostics