Event code Event name Meaning Assumed cause
Level
Reference
M
a
j
P
rt
M
i
n
O
b
s
I
n
f
o
80220000 hex NX Message
Communica-
tions Error
An error was detect-
ed in message com-
munications for an
NX Unit and the mes-
sage frame was dis-
carded.
• The message communications
load is high.
• The communications cable is
disconnected or broken. This
cause does not apply if attach-
ed information 2 is 0 (NX bus).
• Message communications
were cut of
f as the result of ex-
ecuting a synchronization or
restoration operation on the
Sysmac Studio or as the result
of disconnecting an EtherCA
T
slave.
¡
page
12 - 66
951E0000 hex Sysmac Stu-
dio Commu-
nications
Connection
Timeout
A communications
timeout occurred be-
tween the Sysmac
Studio and the Safety
CPU Unit.
• The communications cable
was disconnected.
¡
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12 - 67
951F0000 hex
Clear All
Memory Re-
jected
Clearing all of memo-
ry failed.
• The Clear All Memory opera-
tion for a Controller or a Slave
Terminal was performed.
¡
page
12 - 67
l
User Access Log
Event code Event name Meaning Assumed cause
Level
Reference
M
a
j
P
rt
M
i
n
O
b
s
I
n
f
o
90400000 hex Event Log
Cleared
The event log was
cleared.
• The event log was cleared by
the user.
¡
page
12 - 68
90430000 hex
Memory All
Cleared
The Unit settings
were cleared.
• The Clear All Memory opera-
tion was performed.
¡
page
12 - 68
Safety I/O Units
The errors (events) that can occur in the Safety I/O Units are listed in the following tables.
l
System Error
12 Troubleshooting
12 - 26
NX-series Safety Control Unit User's Manual (Z930)
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