Rockwell Automation Publication 1766-UM001I-EN-P - June 2015 5
Hardware Overview Chapter 1
and 8.30.00 or later for Series B controllers. Communication cables for
programming are available separately from the controller and software.
Communication Options
The MicroLogix 1400 controllers provide three communications ports, an
isolated combination RS-232/485 communication port (Channel 0), an
Ethernet port (Channel 1) and a non-isolated RS-232 communication port
(Channel 2).
The Channel 0 and Channel 2 ports on the MicroLogix 1400 can be connected
to the following:
• operator interfaces, personal computers, etc. using DF1 Full Duplex
point-to-point
• a DH-485 network
• a DF1 Radio Modem network
• a DF1 half-duplex network as an RTU Master or RTU Slave
• a Modbus network as an RTU Master or RTU Slave
• an ASCII network
• an Ethernet network using the Ethernet Interface module (catalog number
1761-NET-ENI, or 1761-NET-ENIW)
• a DNP3 network as a Slave
When connecting to RS-485 network using DH-485, DF1 Half-Duplex
Master/Slave, Modbus RTU Master/Slave or DNP3 Slave protocols, the
MicroLogix 1400 can be connected directly via Channel 0 without an Advanced
Interface Converter, catalog number 1761-NET-AIC. The Channel 0 combo
port provides both RS-232 and RS-485 isolated connections. The appropriate
electrical interface is selected through your choice of communication cable. The
existing MicroLogix 1761 communication cables provide an interface to the
RS-232 drivers. The 1763-NC01 cable provides an interface to the RS-485
drivers.
The controller may also be connected to serial devices, such as bar code readers,
weigh scales, serial printers, and other intelligent devices, using ASCII. See
Default Communication Configuration on page 60 for the configuration settings
for Channel 0. MicroLogix 1400 can be connected directly to RS-485 network
via channel 0, using ASCII.
The MicroLogix 1400 supports EtherNet/IP communication via the Ethernet
communication Channel 1. In addition, either Modbus TCP or DNP3 over IP
can be enabled for Channel 1. You can connect your controller to a local area
network that provides communication between various devices at 10 Mbps or
100 Mbps. This port supports CIP explicit messaging (message exchange) only.
The controller cannot be used for CIP implicit messaging (real-time I/O
messaging). The controller also includes an embedded web server which allows
viewing of not only module information, TCP/IP configuration, and diagnostic
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