5 Troubleshooting
5-16
NJ-series CPU Unit Hardware User’s Manual (W500)
Errors Related to CJ-series Unit Configuration
Event code Event name Meaning Assumed cause
Level
Reference
Maj Prt Min Obs Info
04010000 hex I/O Bus
Check Error
An error occurred in
a bus line transmis-
sion between the
CPU Unit and the
Units in the rack
slots. Or, detection
of all Special I/O
Units and CPU Bus
Units was not com-
pleted when the
power supply to the
Controller was
turned ON.
• The I/O Connecting Cable is
disconnected or wires inside it
are broken.
• Conductive material has gotten
inside.
• The connector contact is faulty
due to foreign material in the
connector.
•Noise
• A Unit has failed.
S page 5-46
24010000 hex Unsupported
Unit Detected
An unsupported
CJ-series Unit or
Power Supply Unit
is mounted.
• An unsupported CJ-series Unit
or Power Supply Unit was
detected.
S page 5-47
24020000 hex Too Many I/O
Points
The total number of
I/O points in the
connected CJ-
series Units
exceeds the maxi-
mum specified
value of the CPU
Unit.
• The total number of I/O points
in the connected CJ-series
Basic I/O Units exceeds 2,560.
S page 5-47
24030000 hex End Cover
Missing
The End Cover is
not connected to
right end of the
CPU Rack or an
Expansion Rack.
• The End Cover is not con-
nected to right end of the CPU
Rack or an Expansion Rack.
• The End Cover is not con-
nected properly.
S page 5-48
24040000 hex Incorrect
Unit/Expan-
sion Rack
Connection
The number of
Units or Expansion
Racks exceeds the
maximum value
specified for the
CPU Unit. Or, an
Interrupt Input Unit
was mounted to a
unsupported slot or
to an Expansion
Rack.
• More than 10 Units are con-
nected to one Rack.
• More than three Expansion
Racks are connected.
• More than two Interrupt Input
Units are mounted.
• An Interrupt Input Unit was
mounted to a unsupported slot
or to an Expansion Rack.
S page 5-48
24050000 hex Duplicate
Unit Number
The same unit num-
ber is set for more
than one Special
I/O Unit or more
than one CPU Bus
Unit.
• The same unit number is set for
more than one Special I/O Unit
or more than one CPU Bus
Unit.
• The same unit number is
assigned to a Special I/O Unit
that uses more than one unit
number and another Special I/O
Unit.
S page 5-49
34010000 hex I/O Setting
Check Error
There is an incon-
sistency between a
Unit model in the
Unit Configuration
in the CPU Unit and
the Unit model that
is mounted in the
Controller.
• A Unit model or Special Unit
unit number in the Unit Configu-
ration in the CPU Unit is differ-
ent from the Unit model or the
Special Unit unit number of the
Unit that is mounted in the Con-
troller
.
S p
age 5-50
44400000 hex PLC Function
Processing
Error
A fatal error was
detected in the PLC
Function Module.
• An error occurred in the soft-
ware.
S page 5-50
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