Toshiba V Series Manual page 11

Mandatory
1. Before switching the DeviceNet devices on,
be sure to supply power to the network.
Some of the slave devices supply the
network power to their local node, or run
into an error in the absence of network
power, so be sure to supply the network
power first.
Unless the network power is supplied, the
DN311 cannot start communication with the
slave devices.
2. Make sure that all the nodes connected to
the network receive the network power.
Any node not receiving the network power
may adversely affect communication with
other nodes.
3. Make sure that all the slave devices have
been switched on before the DN311 starts
communication.
If the DN311 starts communication when
some of the slave devices have not yet
been switched on, the DN311 displays a no-
response error to the slave devices which
have not been started yet.
4. Once the DN311 starts communication,
make sure that the S controller will be the
last one to be switched off so that the
master unit (DN311) will not disappear from
the network.
Mandatory
1. While the DN311 is under reset processing,
do not issue any request from the S
controller to the DN311, or input/output data
to and from the DN311.
Otherwise, the DN311 will be in down mode
because the request will end in an error
(station mode error) or the module self-
check will end in an error.
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Caution
1. When the S controller is in HALT/ERROR
mode, the DN311 in run mode will be in
standby mode.
Caution
1. The DN311 is subject to the following
restrictions on slave devices (polling type)
whose transmission size from the DN311 is
0 byte.
•. If a slave device becomes unable to
communicate with the DN311 for some
reason (power switched off, or connector
disconnected, for example), the DN311
cannot identify that slave device as
abnormal.
Even after the cause of the error has been
removed, communication cannot be
restarted between that slave device and
DN311.
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