HP MicroLogix 1761-NET-ENI manual Ethernet Cables, Maintain ENI Connections

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.

Publication 1761-UM006A-EN-P - February 2001