Rockwell Automation 1761-HHP-B30 MicroLogix 1000 with Hand-Held Programmer (HHP) - Manual (Page 440)

Reference
Appendix D
Understanding the Communication Protocols
D–14
Number of Nodes
The number of nodes on the network directly affects the data transfer time
between nodes. Unnecessary nodes (such as a second programming terminal
that is not being used) slow the data transfer rate. The maximum number of
nodes on the network is 32.
Setting Node Addresses
The best network performance occurs when node addresses are assigned in
sequential order. Initiators, such as personal computers, should be assigned
the lowest numbered addresses to minimize the time required to initialize the
network. The valid range for the MicroLogix 1000 controllers is 1–31
(controllers cannot be node 0). The default setting is 1. The node address is
stored in the controller status file (S:16L).
Setting Controller Baud Rate
The best network performance occurs at the highest baud rate, which is
19200. This is the default baud rate for a MicroLogix 1000 device on the
DH-485 network. All devices must be at the same baud rate. This rate is
stored in the controller status file (S:16H).
Example DH-485 Connections
The following network diagrams provide examples of how to connect Series
C or later MicroLogix 1000 discrete and all MicroLogix 1000 analog
controllers to the DH-485 network using the AIC+. For more information on
the AIC+, see the Advanced Interface Converter and DeviceNet Interface
Installation Instructions, Publication 1761-5.11.