Rockwell Automation 1738-ADNX ArmorPoint I/O DeviceNet Adapters - Manual (Page 32)

Publication 1738-UM001A-EN-P - February 2005
2-16 What Is the ArmorPoint DeviceNet Adapter?
The adapter is capable of holding approximately 64K of configuration
data for ArmorPoint 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 in the adapter.
• The new module matches the old one (i.e., electronic keying).
• The new module is inserted in the 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 MACID 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 MACID is
changed to the appropriate value, if necessary, and the configuration
information is subsequently downloaded to the module.
Physical Ordering
When power is applied, or when an I/O module is inserted, the
adapter detects the backplane I/O modules’ order, based on MACID.
With Physical Ordering, the adapter detects if any ArmorPoint I/O
modules connected to it are out of order. If this condition is detected,
the adapter changes the MACIDs of any new modules.
The adapter’s MACID is always 0 on Subnet. The MACIDs of each
attached backplane I/O module must be sequentially ordered (i.e.,
each module’s MACID is greater than the left adjacent module).
IMPORTANT
If any backplane I/O modules are missing when
power is applied, none of the backplane modules
enter run mode.