Rockwell Automation 1734-ADNX POINT I/O DeviceNet Adpater User Manual - Manual (Page 36)

Publication 1734-UM002C-EN-P - July 2003
2-16 What is the 1734-ADN(X) Adapter?
The adapter is capable of holding approximately 64K of configuration
data for POINT I/O modules connected to it. The adapter sends
configuration data to an I/O module each time connections are
created with that module (i.e., power cycle or module insertion to
backplane).
You can exchange an old module for a new one if the following
conditions are met:
• ADR is enabled for the adapter.
• The new module matches the old one (i.e., electronic keying).
• The new module is inserted in proper location (only for
modules using the backplane).
For modules that do not use the backplane, you can exchange an old
module for a new one if the following conditions are met
• The MAC ID equals 63.
• The new module matches the electronic keying of the old
module.
• Only one missing module matches the electronic keying of the
old module.
If the conditions listed above are met, the new module’s MAC ID is
changed to the appropriate value, if necessary, and the configuration
information is subsequently downloaded to the module.
Physical Ordering
At start-up, or when an I/O module is inserted, the adapter detects the
backplane I/O modules’ order, based on MAC ID. With Physical
Ordering, the adapter detects if any POINT I/O modules connected to
it are out of order. If this condition is detected, the adapter changes
the MAC IDs of any new modules.
The adapter’s MAC ID is always 0 on Subnet. The MAC IDs of each
attached backplane I/O module must be sequentially ordered (i.e.,
each module’s MAC ID is greater than the left adjacent module). Gaps
may be left between modules.
IMPORTANT
If any backplane I/O modules are missing at start-up,
none of the backplane modules enter run mode.