10-1
Section
Troubleshooting with Indicators
170
10-1 Troubleshooting with Indicators
The indicators on the Ethernet Unit can be used to troubleshoot some error. The
probable cause and correction for errors that can be determined from the RUN,
ERC, and ERH indicators are listed in the following table.
RUN
ERC
ERH
Probably 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 Ethernet Unit is faulty.
Replace the Ethernet Unit.
The CPU Unit or Backplane is faulty.
Replace the CPU Unit or the Backplane.
The mounting screws on the Ethernet Unit
are loose.
Tighten the mounting screws to the
specified torque.
Not lit
Not lit
Lit
The unit number on the Ethernet 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
persists, 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
persists, replace the CPU Unit.
Memory in the CPU Unit is faulty.
Restart the CPU Unit. If the problem
persists, replace the CPU Unit.
The CPU Unit is faulty.
Restart the CPU Unit. If the problem
persists, replace the CPU Unit.
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
7F Hex.
The Ethernet Unit is faulty.
Restart the PC. If the problem persists,
replace the Ethernet Unit.
Lit
Lit
---
An error occurred in EEPROM.
Restart the PC. If the problem persists,
replace the Ethernet Unit.
Lit
Flashing
---
The IP address is set incorrectly on the
rotary switches on the back of the Unit.
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 node number set on the rotary switch
on the front of the Unit does not agree with
the host ID in the IP address. This
probably can occur when the address
conversion method is set for automatic
address generation.
Make sure that the node number and the
last byte of the IP address are the same
and set other host IDs to 0.
Change the address conversion method.
