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9 Troubleshooting
NX-series Safety Control Unit User’s Manual (Z930)
9-3 Checking for Errors with the Sysmac Studio
9
9-3-4 Error Descriptions
Event name NX Message Communications Error Event code 8022 0000 hex
Meaning An error was detected in message communications for an NX Unit and the message frame was discarded.
Source Depends on where the Sysmac Stu-
dio is connected and the system con-
figuration.
Source details NX Unit Detection timing During NX mes-
sage communi-
cations
Error attributes Level Observation Recovery --- Log category System
Effects User program Continues. Operation Not affected.
System-defined
variables
Variable Data type Name
None None None
Cause and
correction
Assumed cause Correction Prevention
The message communications load is
high.
Reduce the number of times that
instructions are used to send NX
messages.
Refer to the appendix of the
NJ/NX-series Instructions Reference
Manual (Cat. No. W502) for informa-
tion on the instructions that send
messages.
Reduce the number of times that
instructions are used to send NX
messages.
The communications cable is discon-
nected or broken. This cause does
not apply if attached information 2 is 0
(NX bus).
Connect the communications cable
securely.
Connect the communications cable
securely.
Message communications were cut
off as the result of executing a syn-
chronization or restoration operation
on the Sysmac Studio or as the result
of disconnecting an EtherCAT slave.
--- ---
Attached
information
Attached information 1: System information
Attached information 2: Type of communications where error occurred
0: NX bus
1: EtherCAT
2: Serial communications (USB)
65535: Internal Unit communications (routing)
Precautions/
Remarks
None