Honeywell HC900 manual User Interface, LED Indications on Ethernet Hub

		Diagnostics and Troubleshooting - User Interface
	Table 26 - LED Indications on Ethernet Hub
LED	LED State/Color	Indicates Condition:
10Base-T port
(I/O Expansion –C50
CPU only)
XMT (upper LED)	Green (On/Off)	On while a message is being sent from the Main
		CPU; otherwise Off.
LINK (lower LED)	Green (On/Off)	On while the Main CPU is receiving a message.
		Remains On as long as host is present; Off
		when the host is removed from the link.
	NOTE: These LEDs indicate activity on the communication port, they are
	controlled by hardware (PHY chip), not by software.

User Interface

Table 27 lists Controller Module diagnostic indications (Operator Interface messages, and Status LED) along with causes of the indications, automatic control file actions, and suggested user actions.

Hazardous voltages exist in the equipment enclosure.

•Identify and avoid contact with voltage sources.

•Disconnect power before servicing. (More than one switch may be required to disconnect all power.)

Failure to comply with these instructions could result in death or serious injury.

Table 27 - Controller Module Diagnostics

Table 27 - Controller Module Diagnostics

OI Screen	OI Screen	Number of	Possible Cause	Control File Action	User Action
Item	Item Value	LED
		Strobes
N/A	N/A	1	RAM failed on power-	Executes an infinite loop	1.	Cycle power
			up.	that toggles the LED.	2.	Replace CPU
				Communications and
					3.	Replace rack
				control are disabled.
N/A	N/A	1	ROM failed on power-	Executes an infinite loop	1.	Cycle power
			up.	that toggles the LED.	2.	Replace CPU
				Communications and
					3.	Replace rack
				control are disabled.
SYSTEM	GOOD	N/A	N/A	N/A	N/A
	FORCED	2	A block has an output	None	Remove force on
	OUTPUT		that is forced.		block output.

Revision 5	HC900 Hybrid Controller Installation and User Guide	121
9/03