Rockwell Automation Publication 1766-UM001O-EN-P - September 2021 57
Chapter 4
Communication Connections
The method you use and cabling required to connect your controller depends
on what type of system you are employing. This chapter also describes how the
controller establishes communication with the appropriate network.
The MicroLogix 1400 controllers provide three communication channels, an
isolated RS-232/RS-485 communication port (Channel 0), an Ethernet port
(Channel 1) and a non-isolated RS-232 communication port (Channel 2).
Supported Communication
Protocols
MicroLogix 1400 controllers support the following communication protocols
from the primary RS-232/RS-485 communication channel 0 and the RS-232
communication channel 2:
•DH-485
• DF1 Full-Duplex
• DF1 Half-Duplex Master and Slave
• DF1 Radio Modem
• Modbus RTU Master and Slave
•ASCII
•DNP3 Slave
The Ethernet communication channel, Channel 1, allows your controller to be
connected to a local area network for various devices providing 10 Mbps/100
Mbps transfer rate. MicroLogix 1400 controllers support EtherNet/IP with CIP
explicit messaging (message exchange), BOOTP/DHCP Client, HTTP Server,
SMTP Client, DNS Client, SNMP Server, Socket Interface with CIP Generic
messaging, Modbus TCP Client/Server and DNP3 over IP. MicroLogix 1400
controllers do not support Ethernet I/O master capability through CIP implicit
messaging (real-time I/O messaging).
For more information on MicroLogix 1400 communications, see MicroLogix
1400 Programmable Controllers Instruction Set Reference Manual,
publication 1766-RM001
.
Topic Page
Supported Communication Protocols 57
Default Communication Configuration 58
Use the Communications Toggle Functionality 58
Connect to the RS-232 Port 60
Connect to a RS-485 Network 65
Connect the AIC+ 69
Connect to Ethernet 74
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