Omron NX-OD5256 User Manual

9 Troubleshooting
9 - 12
NX-series Digital I/O Unit User’s Manual (W521)
Event name NX Unit I/O Communications Error Event code 8020 0000 hex
Meaning An I/O communications error occurred between the Communications Coupler Unit and the NX Unit.
Source Depends on where the Sysmac
Studio is connected and the sys-
tem configuration.
Source details NX Unit Detection
timing
Continuously
Error
attributes
Level Minor fault Recovery When the
fail-soft opera-
tion for the
Communica-
tions Coupler
Unit is set to
stop, reset all
errors in Con-
troller.
When the
fail-soft opera-
tion for the
Communica-
tions Coupler
Unit is set to
fail-soft, reset
errors in Com-
munications
Coupler Unit
and NX Unit.
Log category System
Effects User program Continues. Operation The NX Unit will continue to operate.
Input data: Updating input values stops.
Output data: The output values depend on the Load
Rejection Output Setting.
Sys-
tem-defined
variables
Variable Data type Name
None --- ---
Cause and
correction
Assumed cause Correction Prevention
The NX Unit is not mounted prop-
erly.
Mount the NX Units and End
Cover securely and secure them
with End Plates.
Mount the NX Units and End
Cover securely and secure them
with End Plates.
The power cable for the Unit
power supply is disconnected. Or,
the wiring from the Unit power
supply to the NX Units is incorrect.
Correctly wire the Unit power sup-
ply to the NX Units.
Correctly wire the Unit power sup-
ply to the NX Units.
The power cable for the Unit
power supply is broken.
Replace the power cable between
the Unit power supply and the NX
Units.
None
The voltage of the Unit power sup-
ply is outside the specified range.
Or, the capacity of the Unit power
supply is insufficient.
Correctly configure the power sup-
ply system according to the power
supply design methods.
Correctly configure the power sup-
ply system according to the power
supply design methods.
There is a hardware error in the
NX Unit.
If the error occurs again even after
you make the above correction,
replace the NX Unit.
None
Attached
information
None
Precautions/
Remarks
None

Omron NX-OD5256 Specifications

General

Brand	Omron
Model	NX-OD5256
Category	I/O Systems
Language	English