Rockwell Automation 1734-ACNR POINT I/O ControlNet Adapter User Manual - Manual (Page 28)

Publication 1734-UM008B-EN-P - August 2005
3-8 Plan to Use Your Adapter
Configure Autobaud
The adapter cannot reconfigure an I/O module that you previously
configured to operate at a fixed baud rate. When you reuse a POINT
I/O module from another POINT I/O system, configure the module to
autobaud before using it with the 1734-ACNR adapter.
Understand Adapter Data Capability
The 1734-ACNR adapter provides high-speed transfer of time-critical
data between controllers and I/O devices. It manages data transfers
between controllers on the ControlNet network and POINT I/O
modules plugged into the POINTBus backplane.
The ControlNet network is a communication architecture that allows
the exchange of messages between ControlNet products compliant
with the ControlNet International specification. The 1734-ACNR
adapter features include a variety of control system solutions, local
communication network access through the network access port
(NAP) and redundant media. It requires Series C POINT I/O modules
or later.
The 1734-ACNR adapter requires a typical 24V dc power supply with
a maximum of 10.2 W of power. It provides a maximum backplane
current of 1.0 A @ 5V dc.
To extend backplane current beyond 1.0 A use a 1734-EP24DC
backplane extension power supply. The 1734-EP24DC can supply up
to an additional 1.3 A of backplane current. Use multiple
1734-EP24DC power supplies to reach the maximum limit of 63
POINT I/O modules, if 25 or less of these modules are analog or
specialty modules.
The adapter supports 25 direct and 5 rack I/O connections to the
POINT I/O modules. From a single 1734-ACNR adapter, multiple
controllers establish I/O connections, up to a maximum of 5 rack I/O
connections per adapter.
You must use direct connections with analog and specialty modules.
Multiple rack connections permit multiple controllers to connect to
I/O over a single 1734-ACNR adapter.
The number of connections that can actually be supported on a
network depends on the following.
• ControlNet parameters (NUT, RPI, API)