5 Troubleshooting
5-48
NJ-series CPU Unit Hardware User’s Manual (W500)
* For details, refer to I/O Operation for Major Fault Level Controller Errors on page 5-6.
* For details, refer to I/O Operation for Major Fault Level Controller Errors on page 5-6.
Event name End Cover Missing Event code 24030000 hex
Meaning The End Cover is not connected to right end of the CPU Rack or an Expansion Rack.
Source PLC Function Module Source details I/O bus master Detection
timing
Continuously
Error attributes Level Major fault Recovery Cycle the power
supply.
Log category System
Effects User program Stops. Operation Stops.*
System-defined
variables
Variable Data type Name
None --- ---
Cause and
correction
Assumed cause Correction Prevention
The End Cover is not connected to
right end of the CPU Rack or an
Expansion Rack.
Check that the End Cover is correctly
connected and firmly attached. If it is
not, connect it properly.
Design a unit configuration that
includes the End Cover.
The End Cover is not connected
properly.
Confirm that End Cover is connected
correctly when you assemble the
Controller.
Attached
information
None
Precautions/
Remarks
None
Event name Incorrect Unit/Expansion Rack Connection Event code 24040000 hex
Meaning 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.
Source PLC Function Module Source details I/O bus master Detection
timing
At power ON or
Controller reset
Error attributes Level Major fault Recovery Cycle the power
supply.
Log category System
Effects User program Stops. Operation Stops.*
System-defined
variables
Variable Data type Name
None --- ---
Cause and
correction
Assumed cause Correction Prevention
More than 10 Units are connected to
one Rack.
Reduce the number of Units con-
nected to the Rack to 10 or fewer.
Check the maximum number of con-
nections allowed and design a config-
uration that fits within those ranges.
More than three Expansion Racks are
connected.
Reduce the number of Expansion
Racks to three or fewer.
More than two Interrupt Input Units
are mounted.
Reduce the number of Interrupt Input
Units to two or fewer.
An Interrupt Input Unit was mounted
to a unsupported slot or to an Expan-
sion Rack.
Mount the Interrupt Input Units to
slots 0 to 4 on the CPU Rack (i.e., as
one of the five Units to the right of the
CPU Unit).
Attached
information
None
Precautions/
Remarks
None
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