Toshiba nv Series Instruction Manual page 39

Use a screwdriver.
To avoid breaking the screw, use a screwdriver that suitable for
the screw.
During DeviceNet communication, check the transceiver on
the application level.
DN912 has not verified communication with all DeviceNet
devices. Make sure that your system does not operate abnormally
before operating it.
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Unified Controller nv Series DeviceNet Module DN912 Instruction Manual