Allen-Bradley MicroLogix 1761-NET-ENI, User Manual, Page: 21 / 102

Publication 1761-UM006A-EN-P - February 2001
Installation and Wiring 2-7
Ethernet Cables
Shielded and non-shielded twisted-pair 10Base-T cables with RJ45
connectors are supported. The maximum cable length between an
ENI Ethernet port and a 10Base-T port on an Ethernet switch (without
repeaters or fiber) is 100 meters (323 feet). However, in an industrial
application, the cable length should be kept to a minimum.
With media converters or Ethernet switches, you can also connect to
the following media:
•
fiber optic
•
broadband
•
thick-wire coaxial cable (10Base-5)
•
thin-wire coaxial cable (10Base-2)
Maintain ENI Connections
The unshielded twisted pair (UTP) patch cable on a switch should be
labeled and treated as dedicated. Be careful when moving any cables,
as port identity may be effected. If you are using a switch and must
move the ENI to a new port for any reason, power-cycle the ENI. The
power cycle forces a new Address Resolution Protocol (ARP)
sequence which should immediately associate the ENI’s IP address
with the port it is connected to.
You should also discourage any field personal from treating the ports
of a switch as “all the same”. This helps to prevent any problems with
network communications being effected by moving cables.