2-13
Table 2-6. Network Troubles
Trouble Message Possible Causes / Troubleshooting
Missing Card
Indicates that the network card is not communicating with the
master.
• Ensure that no other N2 cards (LCD Annunciator, 24 Point I/O,
RS-232, SDACT, or 4120 Network) have a card address of 8. If
the network card is addressed as card 8, replace the SFIO
card.
• Check the N2 harness. Make sure that all wires are attached to
the correct terminals and all connectors are secure.
• If the network card is reported as missing during a system
reset, upgrade the 4010 BIN file and programmer to Rev. 2.
Wrong Card
Indicates that the card at address 8 is some type other than a
network card.
• Ensure that no other N2 cards (LCD Annunciator, 24 Point I/O,
RS-232, SDACT, or 4120 Network) have a card address of 8. If
the network card is addressed as Card 8, replace the SFIO
card.
Version Mismatch
This trouble indicates that the configuration loaded on the network
card differs from the configuration on the master. Either changes
were made to the database and it was not rebuilt and reloaded, or
the wrong job is loaded.
Net Comm Failure
This trouble indicates that communication was lost between the
network card and the 4120 network.
• Swap another 4120 card in place of the existing card to check
whether the 4120 card is the source of the problem.
• Check all network field wiring for shorts and opens.
• Use the 4100 or GCC diagnostics to troubleshoot; examine the
network attendance and topology screens to determine the
location of the problem.
Ground Fault
If you are using a fiber optic transmitter/receiver module, examine
the network card’s supporting bracket to see if the module is
touching the bracket. If it is, use a strip of insulating material to
isolate the bracket from the fiber optic module.
If you are using a fiber optic network card (565-818) and the ground
fault is intermittent, check to see if resistor R62 is present. It should
be a 10 K resistor. If the resistor is missing, replace the card with
version Rev. A1.
Duplicate Node
This trouble indicates that more than one node on the 4120 network
is answering for the same address. (Note that this trouble is not
presently supported.)
Network Miswire
This trouble indicates that the port-to-port network wiring is
incorrect (i.e. left-to-left or right-to-right). Check the network wiring
and swap if necessary.
Network Troubles
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