Rockwell Automation 1769-SDN Compact I/O DeviceNet Scanner Module User Manual - Manual (Page 114)

114 Publication 1769-UM009E-EN-P - August 2009
Chapter 7 Use the 1769-SDN Scanner Module with MicroLogix Controllers
Channel Parameter
The 1764-LRP controller supports three different pathways for messaging.
Channels 0 and 1 are RS-232 ports and are functionally identical to
MicroLogix 1200 and MicroLogix 1500 1764-LSP controllers. The 1764-LRP
controller also supports backplane communication through the Expansion
Communication Port (ECP) as illustrated below.
When ECP is chosen, you are able to select which slot position (1...16) the
scanner module resides in. The 1764-LRP processor can support up to two
1769-SDN scanner modules with full messaging functionality.
You can use multiple 1769-SDN scanner modules in a MicroLogix 1500
system, but you can message only through the first two. Any other 1769-SDN
scanner module can be used only for I/O scanning.