Rockwell Automation 1761-NET-ENIW MicroLogix Ethernet Interface (ENI) User Manual - Manual (Page 121)

1 Publication 1761-UM006E-EN-P - August 2005
Chapter
9
Troubleshooting
This chapter covers the following Troubleshooting topics:
• Network Troubleshooting
• Using ENI/ENIW with Routers
• LED Sequence at Power-Up
• Troubleshooting Using the LED Indicators
• Error Codes Generated by the ENI/ENIW
Network Troubleshooting Maintain ENI/ENIW Cable Connections
The UTP (unshielded twisted pair) 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 must move the ENI/ENIW to a
new port for any reason, power-cycle the ENI/ENIW. The power cycle
forces a new ARP (address resolution protocol) request to be sent
which should immediately associate the ENI/ENIW’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.
Using ENI/ENIW with
Routers In order to use the ENI/ENIW with standard Ethernet routers, you
must configure the IP address of the router on the local subnet into
the ENI/ENIW Gateway field using either the ENI config utility or
controller messaging. See Chapter 4 for details.
The target device port or socket number is a required field in the
TCP/IP header. When configuring routers, you may need to specify
the module port assignment. The CIP inbound port uses 44818. The
outbound port assignment varies as the processor makes and breaks
connections and binds sockets.