Omron NX-AD series User Manual page 185

Event code Event name
80200000 hex NX Unit I/O
Communica-
tions Error
80210000 hex NX Unit Out-
put Synchro-
nization Error
NX-series Analog I/O Units User's Manual for Analog Input Units and Analog Output Units (W522)
Meaning Assumed cause
An I/O communica- For the NX bus of CPU Units
tions error occurred
• An error that prevents normal
in an NX Unit.
NX bus communications
occurred in a CPU Unit.
• An NX Unit is not mounted
properly.
• The power cable for the Unit
power supply is disconnected,
or the wiring from the Unit
power supply to the NX Units is
incorrect.
• The power cable for the Unit
power supply is broken.
• The voltage of the Unit power
supply is outside the specified
range, or the capacity of the
Unit power supply is insuffi-
cient.
• There is a hardware error in an
NX Unit.
For Communications Coupler
Units
• An error that prevents normal
NX bus communications
occurred in a Communications
Coupler Unit.
• The NX Unit is not mounted
properly.
• The power cable for the Unit
power supply is disconnected.
Or, the wiring from the Unit
power supply to the NX Units is
incorrect.
• The power cable for the Unit
power supply is broken.
• The voltage of the Unit power
supply is outside the specified
range. Or, the capacity of the
Unit power supply is insuffi-
cient.
• There is a hardware error in the
NX Unit.
An output synchro- For the NX bus of CPU Units
nization error
• I/O refreshing on the NX bus is
occurred in the NX
not performed normally due to
Unit.
an error in the CPU Unit.
For Communications Coupler
Units
• The communications cable con-
nected to the Communications
Coupler Unit is broken or the
connection is faulty.
• The communications cable is
affected by noise.
8 Troubleshooting
Level
Maj Prt Min Obs Info
S P. 8-22
S P. 8-24
Reference
8
8 - 9