Rockwell Automation 1761-NET-ENIW MicroLogix Ethernet Interface (ENI) User Manual - Manual (Page 95)

Publication 1761-UM006E-EN-P - August 2005
Connecting CompactLogix Controllers on Ethernet 8-3
Purpose Provide Ethernet connectivity for CompactLogix controllers via the
RS-232 serial port and the ENI/ENIW module.
Scope Connecting CompactLogix controllers on Ethernet requires one
ENI/ENIW per CompactLogix controller. The ENI/ENIW converts
RS-232 hardware connections and DF1 full-duplex protocol to
Ethernet hardware connections and EtherNet/IP protocol.
The ENI/ENIW must be configured with IP addresses assigned to
node numbers 0 to 49. The Destination Node Address in DF1
messages is then used by the ENI/ENIW to route the message to the
proper device on Ethernet.
This application example shows how to configure the ENI/ENIW
module and how to send messages from the CompactLogix controller
to the other controllers on Ethernet. This example also shows how to
initiate messages from the Ethernet controllers to the CompactLogix
controller. Messages sent to the ENI/ENIW module’s IP address will be
delivered to the serial port of the CompactLogix controller.
TIP
In the ENI/ENIW, node addresses 45 through 49 are
dedicated for sending messages to any Logix
controllers with integral Ethernet ports. In addition,
when sending messages to a ControlLogix controller
via a 1756-ENBT, the controller MUST be in slot 0 of
the ControlLogix chassis for the message to be
delivered to it.
Node addresses 0 through 44 are to be used for all
other Ethernet devices, such as other MicroLogix
controllers connected to ENI/ENIW modules or other
controllers with integral Ethernet ports, such as
SLC 5/05, PLC-5E, and MicroLogix 1100.