Emerson E2 operation manual Appendix F Troubleshooting, Refer to .1.9, Powering

Appendix F: Troubleshooting

The chart below describes symptoms and solutions if troubleshooting the system or equipment is needed. For further information, contact Emerson Retail Solutions Service at 1-800-829-2724.

SYMPTOM	POSSIBLE PROBLEM	SOLUTION
I/O Network Problems	I/O board not getting power.	Check I/O board power--is the
		green STATUS light on? If not,
		check power wiring connections,
		and use a multimeter to verify
		the board is getting 24VAC.
		Reset power to board.
	I/O board not communicating or	Check I/O network connections:
	won’t come online.	1. Check wire polarity (positive
		to positive/negative to negative)
		2. Check for broken or loose
		wires.
	Dip switches are set incorrectly.	Check I/O board network dip
		switches. Verify network ID
		number is not a duplicate and
		that baud rate switches are set to
		9600. (If switches are wrong,
		make changes and then reset the
		controller.) Refer to Section
		6.1.6, Network ID Numbers
		(Board Numbers).
	Terminating resistance jumpers	Check for proper setting of ter-
	are set incorrectly.	minating resistance jumpers.
		Network segment should be ter-
		minated on the two endpoints of
		the daisy chain and unterminated
		everywhere else. Refer to Sec-
		tion 6.1.8, Setting the Terminat-
		ing and Biasing Jumpers.
	Boards are not powered.	Check Network/Power voltages.
		Refer to Section 6.1.9, Powering
		the I/O Boards.

Appendix F: Troubleshooting • F-1