Rockwell Automation 1769-SDN Compact I/O DeviceNet Scanner Module User Manual - Manual (Page 111)

Publication 1769-UM009E-EN-P - August 2009 111
Use the 1769-SDN Scanner Module with MicroLogix Controllers Chapter 7
Backplane Messaging The MicroLogix 1500 1764-LRP processor and the 1769-SDN scanner
module also support backplane messaging. This new level of functionality
allows the processor to read (get) or write (set) data to other devices on the
DeviceNet network. This is also referred to as Explicit Messaging.
You can use two different types of messages to exchange information with the
DeviceNet device. The type of message used is determined by the destination
device. You can generate a PCCC message or a CIP message.
PCCC Messaging
Programmable controller communications commands (PCCC) provides point
to point and master/slave communication between devices. PCCC is an open
protocol that is built into all Allen-Bradley controllers, and many other
Allen-Bradley and third-party products.
PCCC messaging has been used for many years on DH-485, DH+, and
Ethernet networks, and for point-to-point communication between
Allen-Bradley controllers. PCCC messaging lets you upload or download
programs over the DeviceNet network, and allows users to message across
DeviceNet networks, just like they did using DH-485 or DH+ networks.
There are a number of devices that support PCCC messaging over DeviceNet,
including the 1761-NET-DNI (DNI) interface, 1203-GU6 interface, and
RSLinx software. If the DeviceNet network has DNI interfaces, either device
can initiate a PCCC message.