User manual

DeviceNet 5-6

Automatic Device Recovery (ADR)

This is a feature of the DeviceNet master which allows a slave node that has

dropped off the network (Fault, power loss, etc.) to be replaced with another

device of the same type. There are 2 parts to ADR, Address Recovery, and Con-

figuration Recovery.

Address Recovery

Address Recovery is responsible for automatically setting a new device’s address

to that of a slave that has lost communications.The steps followed by ADR are:

1. When the master detects loss of a slave, it begins to monitor for a

device at MAC ID 63.

2. An identical device is added to the network at MAC ID 63.

3. The master verifies that the new device at 63 is exactly the same kind

as the slave that was lost.

4. The master changes the new device’s MAC ID from 63 to that of the

lost slave.

Configuration Recovery

Configuration Recovery is responsible for setting the configuration of a slave

device to the configuration that is stored in the BridgeWay. The slave’s configura-

tion is stored in the BridgeWay’s non-volatile memory. Whenever the BridgeWay

establishes communication with the slave device, the configuration is downloaded

to the slave.

Configuration recovery serves 2 purposes. 1. If a new device is added to the net-

work to replace a faulted slave, after Address Recovery is completed, Configura-

tion Recovery will configure the new device. 2. Configuration Recovery

guarantees that the slave devices will always run the same configuration.

The BridgeWay module will hold up to 130,560 bytes (approximately 128K) of

configuration recovery data.

Note: RSNetworx v7.0 or later is required to support the full 128K bytes of ADR

configuration recovery data; earlier versions support up to 64K bytes of data.

NetTool-DN-D, as of v3.3.1, supports up to 64K bytes of configuration recovery

data.