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9-1SectionBoard Replacement
120
9-1 Front-panel Indicator Error Displays
Indicators
Possible cause Remedy
Board CPU Unit
RDY ERR/ALM
Lit Not lit The Serial Communications Board has
started normally.
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Not lit Lit The Serial Communications Board is faulty
(hardware self-diagnostic function).
Board watchdog timer error: IR 20000 will
turn ON.
A bus error has occurred.
An initialization recognition error has
occurred (the Serial Communications
Board is not correctly recognized by the
CPU Unit).
If the ERR and ALM indicators light when
the Serial Communications Board is
mounted to another CPU Unit, replace the
Serial Communications Board.
Firmly secure the Serial Communications
Board to the CPU Unit.
Not lit Not lit The CPU Unit is not receiving normal
power supply.
The Serial Communications Board is not
correctly secured to the CPU Unit.
The Serial Communications Board is faulty.
An error (such as a CPU Unit WDT error)
has occurred in the CPU Unit.
Check the power supply voltage and
supply the correct electric power to the
Unit.
Firmly secure the Serial Communications
Board.
If all the indicators are not lit when the
Serial Communications Board is mounted
to another CPU Unit, replace the Serial
Communications Board.
Eliminate the cause of the error. If the error
persists, replace the CPU Unit.
Lit Lit The Serial Communications Board is faulty.
A bus error has occurred.
If all the indicators are lit when the Serial
Communications Board is mounted in
another CPU Unit, replace the Serial
Communications Board.
Check the operating environment and
eliminate the cause of the error.
Firmly secure the Serial Communications
Board.
Lit Flashing An error has occurred in the CPU Unit.
(Cause of error eliminated, but error not
cleared.)
Eliminate the cause of the error. If the error
persists, replace the CPU Unit.
Flashing Flashing A protocol data write error has occurred or
protocol data has been destroyed.
(Protocol data error: IR 20002)
Connector may have become loose or the
PC power supply may have turned OFF
while transferring protocol data.
There is no protocol data.
The communications circuit is faulty.
(Board Identification Error Flag: IR 20001)
A protocol data syntax error has occurred.
(Protocol macro error code: 4)
A PC Setup error has occurred.
(PC Setup Error Flags: IR 20013 to
IR 20015)
If the indicator status remains the same
when the protocol data is retransmitted,
replace the Serial Communications Board.
Transfer protocol data to the Serial
Communications Board.
Conduct a loopback test. If an error
occurs, replace the Serial Communications
Board.
Correct the protocol data and transfer it to
the Serial Communications Board.
Try executing a normal sequence for the
serial port where the error is occurring or
switch the CPU Unit to PROGRAM mode
and remove the cause of the error.
Correct the PC Setup settings.