HP MicroLogix 1761-NET-ENI manual Power-Up Sequence, On solid for 2 seconds, Flashes for 4 seconds

Chapter 8

Troubleshooting

This chapter covers the following Troubleshooting topics:

•Network Troubleshooting

•LED Sequence at Power-Up

•Troubleshooting Using the LED Indicators

•Error Codes Generated by the ENI

•Message Instruction Error Codes

Network Troubleshooting	Maintain ENI 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 to a new
	port for any reason, power-cycle the ENI. The power cycle forces a
	new ARP (address resolution protocol) request to be sent 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.

LED Sequence at Power-UpThe following LED test is performed at power-up.

LED	Power-Up Sequence
Ethernet TX/RX, Link and FAULT	1.	on solid for 2 seconds
FAULT	2.	flashes for 4 seconds
Ethernet TX/RX and FAULT	3.	on solid for 1/4 second
All LEDs	4.	off, unless an error condition exists
		(see troubleshooting table on page 8-2)

Publication 1761-UM006A-EN-P - February 2001