Table of Contents
Supported Communication
Protocols
Rockwell Automation Publication 1766-UM001I-EN-P - June 2015
Communication Connections
This chapter describes how to communicate with your control system. 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. Topics include:
• supported communication protocols
• default communication configurations
• using communications toggle functionality
• connecting to RS-232 port
• connecting to RS-485 network
• connecting to AIC+
• connecting to Ethernet
The MicroLogix 1400 controllers provide three communication channels, an
isolated RS-232/485 communication port (Channel 0), an Ethernet port
(Channel 1) and a non-isolated RS-232 communication port (Channel 2).
MicroLogix 1400 controllers support the following communication protocols
from the primary RS-232/485 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).
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