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3.5.5 Procedure for Switching-ON/Shutting-OFF the Power
This section describes the order of switching on the slave devices power, the network power, and
the T2/T2E/T2N side power before starting up the DN211. Check all device wiring and settings
are completed before switching ON in the following order.
(1) When Starting up the System
a) The network power
b) The slave device power
c) The T2/T2E/T2N side power
d) Activating the DN211 communication
The DN211 doesn't yet start communication when the T2/T2E/T2N side power is switched ON.
Set the parameters of the local nodes and register the parameters of the slave devices in the
scanning list before engaging in communication start processing. See "5.2 Module Setting
Procedure" for detailed procedures.
CAUTION
1. Be sure to turn ON the network power before turning ON the power of the DeviceNet devices.
Some nodes of the slave devices use the network power as the operation power while other
slave devices indicate an error when their work power is not supplied. Therefore, be sure to
switch ON the network power. Also note unless the network power is switched ON, your
DN211 cannot start communication with slave devices.
2. Be sure the network power is supplied to all the nodes being connected with the network. The
node to which no network power is supplied could cause communication obstacle to other
nodes.
3. Make sure the power of all slave devices is switched ON before the DN211 begins
communication.
When the DN211 begins communication while the power of a slave device is not switched
ON, the DN211 will display an error message of no response from that device.
(2) When Deactivating the System
a) The slave devices power
b) The network power
c) (HALT the operation mode of the T2/T2E/T2N.)
d) The T2/T2E/T2N side power
CAUTION
4. While network communications are operating, don't shut OFF the network power. Failing to
do so will cause the entire network communications to stop and, one of the nodes become
busoff state.
5. Switch OFF the T2/T2E/T2N side power at last after the DN211 begins communication. This
helps the master device (DN211) to be recognized from the network and prevents slave
devices from malfunctioning.