Appendix F: Troubleshooting - Emerson E2 Installation And Operation Manual

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
I/O Network Problems
POSSIBLE PROBLEM
I/O board not getting power.
I/O board not communicating or
won't come online.
Dip switches are set incorrectly.
Terminating resistance jumpers
are set incorrectly.
Boards are not powered.
SOLUTION
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.
Check I/O network connections:
1. Check wire polarity (positive
to positive/negative to negative)
2. Check for broken or loose
wires.
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).
Check for proper setting of ter-
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.
Check Network/Power voltages.
Refer to Section 6.1.9, Powering
the I/O Boards.
Appendix F: Troubleshooting
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