Omron NX1P2 series User Manual page 274

6 Troubleshooting
Event name NX Bus Communications Error
Meaning A communications error that prevents normal NX bus communications was detected.
If there are more than one NX Unit relevant to this event, only the NX Unit that is nearest to the CPU Unit is registered
with the event.
Source NX Bus Function Module
Error attributes Level
Effects User program
System-defined Variable
variables
None
Cause and Assumed cause
correction
The NX bus connector contact is
faulty due to vibration or shock.
Excessive noise is applied to the NX
bus connector.
An NX Unit was removed.
An error occurred in an NX Unit.
Attached Attached information 1: Unit number of the NX Unit where the error occurred
information
Precautions/ None
Remarks
Event name NX Unit Communications Timeout
Meaning An error occurred in I/O data communications with the NX Units.
Source NX Bus Function Module
Error attributes Level
Effects User program
System-defined Variable
variables
None
Cause and Assumed cause
correction
An NX Bus Communications Error
has occurred.
An error occurred in an NX Unit.
Attached Attached information 1: Unit number of the NX Unit where the error occurred
information
Attached information 2: System information
Precautions/ None
Remarks
6 - 56
Source details
Minor fault Recovery
Continues. Operation
Data type
---
Correction
Mount the NX Units and End Cover
securely and secure them with End
Plates.
Implement noise countermeasures
according to the user's manual.
Mount the removed NX Unit again.
Cycle the power supply to the rele-
vant NX Unit. If this error persists,
replace the NX Unit.
Source details
Minor fault Recovery
Continues. Operation
Data type
---
Correction
Correct the NX Bus Communications
Error.
Cycle the power supply to the rele-
vant NX Unit. If this error persists,
replace the NX Unit.
Event code 85500000 hex
Master Detection
timing
Cycle the power Log category
supply to the
CPU Unit, reset
the Controller, or
restart the NX
bus.
For NX Units located outside the NX Unit where an error
occurred, I/O communications will not operate and mes-
sage communications cannot be performed.
Name
---
Prevention
Perform installation according to the
user's manual.
None
Event code 85510000 hex
Master Detection
timing
Error reset Log category
For NX Units with this error, I/O communications will not
operate, but message communications can be performed.
Name
---
Prevention
Take preventive measures against
the NX Bus Communications Error.
None
NX-series NX1P2 CPU Unit Hardware User's Manual (W578)
Continuously
System
Continuously
System