Event name Allowed Communications Bandwidth per Unit Exceed-
ed
Event code 840C0000 hex
Meaning The total bandwidth for the connections that are set or established for all of the EtherNet/IP ports exceeded the
allowed communications bandwidth of tag data links and CIP Safety communications per Unit.
Source X Bus EtherNet/IP Function Mod-
ule
Source details 1 to 4: Mounting
position of the X
Bus Unit (unit
number)
and
CIP1/CIP2
are
given in combi-
nation
Detection tim-
ing
When establish-
ing a tag data
link connection
or a CIP safety
connection
Error attributes Level Minor fault Recovery Automatic re-
covery (after
downloading the
settings), cycle
the power sup-
ply, or Controller
reset
Log category System
Effects User program Continues. Operation T
ag data links and CIP Safety communications that
exceed the unit's allowable communication bandwidth
do not operate.
Indicators EtherNet/IP NET RUN EtherNet/IP NET ERR EtherNet/IP LINK/ACT
Flashes at 1-s intervals. Flashes at 1-s intervals. ---
Device variable Variable Data type Name
EIP_Comm1Status.TDLinkOpnErr BOOL CIP Communications1 Tag Data
Link Connection Failed
EIP_Comm2Status.TDLinkOpnErr BOOL CIP Communications2 Tag Data
Link Connection Failed
Cause and cor-
rection
Assumed cause Correction Prevention
An attempt was made to establish
a connection of communications
bandwidth (PPS), which is the sum
of the packet transmission rates of
the tag data links and CIP Safety
communications used for all Ether-
Net/IP ports, and it exceeded the
allowable communications band-
width of the Unit.
Change the settings of the origina-
tor node for tag data links and CIP
Safety communications so that
PPS for all port of the Ethernet/IP
port is within the allowable commu-
nications bandwidth per Unit, and
cycle the power supply to the Con-
troller or reset the Controller
.
Set tag data links and CIP Safety
communications so that PPS for all
ports of the Ethernet/IP port is
smaller than the allowable commu-
nications bandwidth per Unit.
Attached infor-
mation
None
Precautions/
Remarks
The bandwidth usage (PPS) for tag data links on the EtherNet/IP port is shown on the Ethernet Information
tab page of the Network Configurator.
For the procedure to check the bandwidth usage (PPS), refer to the description on Ethernet Information
Tab
Page in Checking Communications Status with the Sysmac Studio and Troubleshooting on the NJ/NX-series
CPU Unit Built-in EtherNet/IP Port User’s Manual (Cat. No. W506).
14 Troubleshooting
14-39
NX-series EtherNet/IP Unit User's Manual (W627)
14-4 Checking with the Sysmac Studio, an HMI, and Instructions That Read Error
Status
14
14-4-4 Error Details
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