Rockwell Automation 1769-SDN Compact I/O DeviceNet Scanner Module User Manual - Manual (Page 81)

Publication 1769-UM009E-EN-P - August 2009 81
Manually Configure the DeviceNet Network Chapter 5
ADR allows a slave device to be removed from the network and replaced with
another identical slave device that is residing on the network at node address
63 and is not in the scan list. The replacement device will have its node address
automatically changed to that of the device being replaced. Depending on the
level of revision keying, it may be possible for the node address of the
replacement device to be changed but not brought online due to a
revision-keying mismatch.
The 1769-SDN scanner module can handle any number of device failures
simultaneously, however, the AAR feature will be disabled for devices that
have the same electronic key. The CR feature will remain active. In this case,
you must use the Node Commissioning tool that ships with RSNetWorx for
DeviceNet software to change the node’s address.
If the electronic key of the replacement device differs only by revision, the CR
feature may not work. Before replacing any device, you should make sure that
the configuration parameters of the replacement device are compatible with
the existing device.
Important Considerations
Keep the following in mind when using the ADR feature with RSNetWorx for
DeviceNet software:
• ADR is intended for use in single-master environments.
• The CR and AAR features can be used only with devices that are in the
scanlist of the scanner.
• The AAR feature can be enabled for a device only if the CR feature is
also enabled.
• The CR feature cannot be enabled for devices that have no writable
parameters (for example, a device that is entirely configured using
hardware switches).
RSNetWorx for DeviceNet software will notify you of devices that have
no writable parameters.
• The AAR feature will not work for devices that do not support changing
the node address over the network.
IMPORTANT
This behavior may introduce a possible safety hazard for
devices such as drives. Use the full electronic key, including
revision. You must be using a 1769-SDN scanner module and
RSNetWorx for DeviceNet software to enable electronic key
revision checking.