Download 1766-RM001 - Rockwell Automation

Appendix D
Protocol Configuration
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 controllers is 1…31 (controllers
cannot be node 0). The default setting is 1. The node address is stored in the
controller Communications Status file (CS0:5/0…CS0:5/7). Configure the node
address via Channel Configuration using RSLogix 500/RSLogix Micro. Select
the Channel 0 tab.
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 devices on the DH-485 network.
All devices must be at the same baud rate. This rate is stored in the controller
Communications Status file (CS0:5/8…CS0:5/15). Configure the baud rate via
Channel Configuration using RSLogix 500/RSLogix Micro. Select the Channel 0
tab.
Setting Maximum Node Address
Once you have an established network set up, and are confident that you will not
be adding more devices, you may enhance performance by adjusting the
maximum node address of your controllers. It should be set to the highest node
address being used.
IMPORTANT
All devices should be set to the same maximum node address.
MicroLogix 1400 Remote Packet Support
These controllers can respond and initiate with device’s communications (or
commands) that do not originate on the local DH-485 network. This is useful in
installations where communication is needed between the DH-485 and DH+
networks.
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Rockwell Automation Publication 1766-RM001F-EN-P - May 2014