Publication 1756-UM514B-EN-P - February 2003
12-4 Troubleshooting the 1756-DHRIO Module
Minimizing False Received
Frame with Bad CRC
Messages
A 1756-DHRIO module that communicates with a 1784-KT or
1784-PCMK communication card on its DH+ link may receive the
following error message:
Received Frame with Bad CRC
This error does not affect DH+ link operations. To minimize its
occurrence, make sure that the DH+ link is terminated properly.
Chapter Summary and
What’s Next
In this chapter, you learned about troubleshooting your 1756-DHRIO
module.
Appendix A lists Specifications.
Table 12.4
Interpreting the Channel Status Indicators
If the channel A
or B indicator
is:
in this channel
mode:
then the channel
status is:
take this action:
Off All Not on line. Place channel on line.
Green RIO scanner Active remote I/O link.
All adapter modules
are present and not
faulted.
None, normal
operation.
DH+ Operating. None, normal
operation.
Green flashing RIO scanner One or more nodes
faulted or failed.
Check power at other
racks.
DH+ No other node on the
network.
Check cables.
Red All Hardware fault. Reboot module. If red
reoccurs, replace
module.
Red flashing RIO scanner Faulted adapters
detected.
Check cables.
Check power at other
racks.
DH+ Duplicate node
detected.
Check node address.
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