Publication 1734-UM002C-EN-P - July 2003
2-6 What is the 1734-ADN(X) Adapter?
– If modules of the same type are removed and returned to the
wrong locations, the adapter identifies the returned modules,
updates their MAC IDs and continues operation.
Understanding the
DeviceNet Network
and Subnet
DeviceNet Network
Your adapter serves as a slave to DeviceNet masters. The adapter
receives data from and returns data to the master through the
following I/O connections:
• Change of State (COS)
• Cyclic
• Polled
• Strobe
Subnet Network
On the Subnet, your adapter acts as a scanner and is the master of the
Subnet modules. The adapter performs the following functions:
• Exchanges I/O data with devices on Subnet
IMPORTANT
The removal and return scenario exists whether the
system is under power or not. If the system is under
power, the scenario arises immediately. If the system
is not under power, the scenario arises in the next
power cycle.
Also, the example above shows removal of two
adjacent modules. The scenario described exists
anytime 2 or more adjacent modules are removed
and not all are returned.
IMPORTANT
Care must be taken when replacing backplane I/O
modules. Each I/O module stores its configuration
parameters in internal non-volatile memory. You
must either enable ADR for all modules or manually
configure each module in a non-manufacturing
environment when the module is being replaced or
placed on the network for the first time. Failure to do
so could result in inadvertent control attributed to
different configuration settings.
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