Troubleshooting With Indicators - Omron CS Series Operation Manual

Troubleshooting with Indicators

8-1

Troubleshooting with Indicators

RUN ERC ERH LNK
Not lit Not lit Not lit ---
Not lit Lit Not lit ---
Not lit Not lit Lit ---
Lit --- --- Not lit
Lit --- Lit ---
Not lit ---
Lit Lit --- ---
204
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
LINK, HOST, RUN, ERC, and ERH indicators are listed in the following table.
HOST Probably cause
--- Power is not being supplied to the CPU
Unit or the power supply voltage is too
low.
The Ethernet Unit is faulty.
The CPU Unit or Backplane is faulty.
The mounting screws on the Ethernet
Unit are loose (CS Series) or the sliders
are not properly locked into place (CJ
Series).
--- The node address is set outside the cor-
rect range on the rotary switches.
The Ethernet Unit is faulty.
--- The unit number on the Ethernet Unit is
not set correctly on the rotary switch.
The I/O tables are not registered in the
CPU Unit.
The same unit number is being used on
another Unit as well.
The CPU Unit is faulty.
--- There is no communications link with the
hub.
--- There is a mistake in the Unit Setup or
routing tables.
Memory in the CPU Unit is faulty.
The CPU Unit is faulty.
Lit There is a mistake in the settings for a
server (DNS, SMTP, POP3, or SNTP) in
the Unit Setup.
Lit An error occurred in communications with
the server.
--- An error occurred in EEPROM.
Section 8-1
Correction
Supply power.
Make sure that the correct voltage is
being supplied.
Replace the Ethernet Unit.
Replace the CPU Unit or the Back-
plane.
Tighten the mounting screws to the
specified torque (CS Series) or lock
the sliders into place (CJ Series).
Set the node address to between 01
and FE Hex.
Restart the PLC. If the problem per-
sists, replace the Ethernet Unit.
Correct the unit number setting.
Register the I/O tables.
Correct the unit number.
Restart the CPU Unit. If the problem
persists, replace the CPU Unit.
If power is not turned ON to the hub,
turn it ON.
If there is crossed cable between the
Ethernet Unit and the hub, use
straight cable.
Read the error history and correct
the data that is causing the error. If
the problem persists, replace the
CPU Unit.
Restart the CPU Unit. If the problem
persists, replace the CPU Unit.
Restart the CPU Unit. If the problem
persists, replace the CPU Unit.
Read the error status and history
and correct the data that is causing
the error. If the problem persists,
replace the CPU Unit.
Inspect the communications path
(Ethernet Unit, cable connections,
hub, router, server), and correct the
situation that is causing the error.
Restart the PLC. If the problem per-
sists, replace the Ethernet Unit.