Omron NJ501-1400 User Manual page 228

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