Rockwell Automation 1738-AENTR, Series B POINT I/O and ArmorPOINT I/O Dual Port EtherNet/IP Adapters User Manual - Manual (Page 14)

6 Rockwell Automation Publication 1734-UM017B-EN-P - October 2013
Chapter 1 Overview of the 1734 POINT and 1738 ArmorPOINT EtherNet/IP Adapters
• 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 will 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 situations exist 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.
Power Up a System for the First Time
When you power the I/O for the first time, the adapter must assign slot addresses
to every module in the backplane. All I/O modules ship configured at the same
address.
When you first apply power, we expect that all but one module on the backplane
exhibits a solid red Module Status LED.
One by one the adapter resets these modules and addresses them appropriately.
The amount of time that this operation takes is proportional to the size of your I/
O system.
Use of the Common
Industrial Protocol (CIP) The adapter uses the Common Industrial Protocol (CIP). CIP is the application
layer protocol specified for EtherNet/IP, the Ethernet Industrial Protocol, as well
as for ControlNet and DeviceNet networks. It is a message-based protocol that
implements a relative path to send a message from the producing device in a
system to the consuming devices.
The producing device contains the path information that steers the message along
the proper route to reach its consumers. Since the producing device holds this
information, other devices along the path simply pass this information; they do
not store it.
This has the following significant benefits:
• You do not need to configure routing tables in the bridging modules,
which greatly simplifies maintenance and module replacement.
• You maintain full control over the route taken by each message, which
enables you to select alternative paths for the same end device.