Rockwell Automation 1734-AENT POINT I/O EtherNet/IP Adapter Module - Manual (Page 19)

Publication 1734-UM011D-EN-P - May 2011
About the Adapter 3
• A correct POINT I/O system does not have any empty terminal bases.
• After you cycle power, the adapter does not run any I/O until the
number of modules comprising the chassis equals the stored chassis
size.
– Because the adapter cannot detect empty terminal bases, it cannot
assume any safe operation until there is a match between the number
of modules indicating their presence in the chassis and what the
adapter has saved in non-volatile memory.
– Actual module identification (such as, electronic keying) is done
when connection establishment requests are received from the
controller or controllers.
• A module removed under power does not disrupt operation of the other
I/O modules.
– When you remove a module, the adapter determines what changed.
– Whenever you remove a module with an active connection from the
POINT I/O system, the adapter indicates this by flashing the
POINTBus Status LED red and reports a minor recoverable fault.
• If more than one contiguous module is removed under power,
connections to all modules in the contiguous missing module set are
disallowed until all modules are replaced. Because the adapter cannot
detect an empty base, it does not know the physical positioning of the
modules until all the missing modules are replaced.
• If a module separating two sets of contiguous missing modules is
removed, the two sets merge into a single set. All the modules must be
replaced before connections are permitted to any module in the set.
• If modules of different types are removed and returned to the wrong
locations, attempts to connect to these modules fail during verification
of the electronic ID (providing that keying has not been disabled).
• If modules of the same type are removed and returned to the wrong
locations, they accept connections from the controller or controllers and
reconfigure with the correct data once they pass their electronic keying
check.
• These removal and return conditions apply whether the system is under
power or not. If the system is under power, the situation arises
immediately. If the system is not under power, the situation arises in the
next power cycle.