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Appendix F: Troubleshooting • F-1
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
won’t come online.
Check I/O network connections:
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
are set incorrectly.
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.
Boards are not powered. Check Network/Power voltages.
Refer to
Section 6.1.9, Powering
the I/O Boards.