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Troubleshooting with Indicators Section 10-1
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10-1 Troubleshooting with Indicators
The indicators on the FL-net Unit can be used to troubleshoot some errors.
The probable cause and correction for errors that can be determined from the
RUN, HER, and PER LED indicators are listed in the following table.
RUN HER PER Probable cause Correction
Not lit Not lit Not lit Power is not being supplied to the CPU Unit
or the power supply voltage is too low. Supply power.
Make sure that the correct voltage is being
supplied.
The FL-net Unit is faulty. Replace the FL-net Unit.
The CPU Unit or Backplane is faulty. Replace the CPU Unit or the Backplane.
The mounting screws on the FL-net Unit
are loose. Tighten the mounting screws to the speci-
fied torque.
Not lit Not lit Lit The unit number on the FL-net Unit is not
set correctly on the rotary switch. Correct the unit number setting.
The I/O tables are not registered in the
CPU Unit. Register the I/O tables.
The same unit number is being used on
another Unit as well. Correct the unit number.
The CPU Unit is faulty. Restart the CPU Unit. If the problem per-
sists, replace the CPU Unit.
Lit --- Lit There is a mistake in the CPU Bus Unit
Setup or routing tables. Read the error history and correct the data
that is causing the error. If the problem per-
sists, replace the CPU Unit.
Memory in the CPU Unit is faulty. Restart the CPU Unit. If the problem per-
sists, replace the CPU Unit.
The CPU Unit is faulty. Restart the CPU Unit. If the problem per-
sists, replace the CPU Unit.
Failed to read files in Memory Card for the
simple backup function. Check that the Memory Card is installed
and that the correct backup file is saved in
the Memory Card.
Not lit Lit Not lit The node address is set outside the correct
range on the rotary switches. Set the node number to between 01 and F9
Hex.
The FL-net Unit is faulty. Restart the PLC. If the problem persists,
replace the FL-net Unit.
Lit Lit --- The communications cable is discon-
nected.
(Transceiver Error Flag: ON) The communications cable may be discon-
nected. Check that the communications
cable is connected securely.
An error occurred in EEPROM. Restart the PLC. If the problem persists,
replace the FL-net Unit.
Lit Flashing --- The IP address is set incorrectly. Correct the IP address. Do not set any of
the following IP addresses.
• Host IDs that are all 0 or all 1.
• Network IDs that are all 0 or all 1.
• Subnetwork IDs that are all 1.
• Addresses beginning with 127 (7F Hex).
The PLC was removed from the network
because another node with the same node
number was detected. Another node with the same node number
is already present on the network. Change
the setting so no two nodes have the same
number.