User manual

Appendix B: Troubleshooting
SYMPTOM POSSIBLE PROBLEM SOLUTION
Board Offline I/O Network Problems Check wiring polarity. Verify the
485+ uses one color and the 485-
uses the other color throughout
the network.
Check each connector for any
loose wires or frayed strands
between connectors.
Termination Jumpers Set Incor-
rectly
Verify all three jumpers are set in
the UP position if the board is at
the end of a daisy chain, and that
all other boards are not termi-
nated (jumpers in DOWN posi-
tion).
Board Not Receiving Power Refer to Figure 3-1 for the fol-
lowing steps:
1. Verify proper transformer wir-
ing. Check that the 28 VAC sec-
ondary switch is in the ON
position.
2. Verify that the secondary
power is 28 VAC and the wires
are connected properly.
3. Check Fuses F5 and F6.
4. Verify line voltage is con-
nected to high-line side of the
control power transformer.
Dip Switches Set Incorrectly Check 8RO address, 16AI
address, and baud rate settings.
Refer to Section 4.2.1., Gateway
Board Numbering and Section
4.2.2., Setting the Baud Rate Dip
Switches.
Note: after changing dip switch
settings, cycle power to board
using the 28 VAC secondary
power switch (flip to the OFF
position and then to the ON posi-
tion).