Omron NJ501-1320 - Page 229

5-49
5 Troubleshooting
NJ-series CPU Unit Hardware User’s Manual (W500)
5-2 Troubleshooting
5
5-2-4 Error Descriptions
* For details, refer to I/O Operation for Major Fault Level Controller Errors on page 5-6.
Event name Duplicate Unit Number Event code 24050000 hex
Meaning The same unit number is set for more than one Special I/O Unit or more than one CPU Bus Unit.
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
The same unit number is set for more
than one Special I/O Unit or more
than one CPU Bus Unit.
Check that the same unit number is
not used for more than one Special
I/O Unit or CPU Bus Unit by checking
the rotary switches. If the same unit
number is used more than once for
the same Unit configuration, change
the unit number.
Make sure that the same unit number
is not used for more than one Special
I/O Unit. Also, make sure that the
same unit number is not used for
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.
Check whether a Special I/O Unit or
CPU Bus Unit that uses more than
one unit number is included in the
configuration. If there is, check to see
if one of the unit numbers assigned to
it is used by another Special I/O Unit
or CPU Bus Unit. If it is, change the
unit number.
Attached
information
Attached information 1: Rack number where error was detected, 0 to 3
Attached information 2: Slot number where error was detected, 0 to 9
Attached information 3: Special I/O Unit: Duplicated unit number + 20 hex
CPU But Unit: Duplicated unit number + 10 hex
Precautions/
Remarks
Check the model of the Special I/O Unit. Some Special I/O Units use up to four unit numbers.