9-15
9 Troubleshooting
NJ/NX-series CPU Unit Built-in EtherCAT Port User’s Manual (W505)
9-2 Troubleshooting
9
9-2-4 Diagnostic and Statistical Information
The values of the following items may increase if there is an EtherCAT network error.
The following table gives the description of each item, assumed cause of increase, and correction.
Item Displayed information Assumed cause of increase Possible correction
Frame recep-
tion timeout
count
The number of frame
reception timeouts that
occurred.
A cause to a Process Data reception
Timeout occurred, which increases
the Frame reception timeout count.
The Frame reception timeout count
will increase also when the count in
the CRC Error Frames Received,
Short frames received, or Overlength
frames received increases.
Refer to EtherCAT Network Diagnostic
Procedure on page 9-4.
Reception buf-
fer overflow
count
The number of frames
discarded due to buffer
overflows when receiv-
ing data.
There are too many frames on the
EtherCAT network that are not Ether-
CAT frames.
See if there are computers or other
non-EtherCAT devices connected to
the EtherCAT network and remove
them if there are any.
Non-Ether-
CAT frames
received
The number of frames
received other than Eth-
erCAT frames.
There are frames on the EtherCAT
network that are not EtherCAT
frames.
See if there are computers or other
non-EtherCAT devices connected to
the EtherCAT network and remove
them if there are any.
Link OFF
count
The number of times
link OFF was detected.
A cause to a Link OFF Error occurred. Refer to Error Tables in Errors in the
EtherCAT Master Function Module in
the NJ/NX-series Troubleshooting
Manual (Cat. No. W503-E1-19 or later)
and remove the cause of the error.
Discarded pro-
cess data
receptions
The number of process
data packets discarded
when receiving process
data.
Operations for which multi-execution
is prohibited in Prohibition to Physi-
cally Disconnecting a Slave and
Resetting an Error or Connecting a
Slave at the Same Time on page 9-26
were executed.
The value sometimes increases when
the network is started or communicat-
ing EtherCAT slaves are replaced.
Refer to Prohibition to Physically Dis-
connecting a Slave and Resetting an
Error or Connecting a Slave at the
Same Time on page 9-26.
Discarded
message
receptions
The number of mes-
sages discarded in mail-
box reception.
A cause to an EtherCAT Message
Error occurred.
Refer to Error Tables in Errors in the
EtherCAT Master Function Module in
the NJ/NX-series Troubleshooting
Manual (Cat. No. W503-E1-19 or later)
and remove the cause of the error.
CRC Error
Frames
Received
The number of frames
received that resulted in
CRC errors.
The frames on the EtherCAT network
are corrupted.
Refer to EtherCAT Network Diagnostic
Procedure on page 9-4.
Frame recep-
tion errors
The number of frames
resulting in reception
errors from the Ether-
net controller (Ether-
MAC).
The frames on the EtherCAT network
are corrupted due to noise.
Implement noise countermeasures.
Collision count The total number of
delay collisions on the
line after start of trans-
missions.
A repeater hub is connected. You cannot use repeater hubs with Eth-
erCAT communications. See if there
are repeater hubs connected to the
EtherCAT network and remove them if
there are any.
Short frames
received
The number of frames
received with less than
64 bytes.
The frames on the EtherCAT network
are corrupted due to noise. Comput-
ers or other non-EtherCAT devices
are connected.
Refer to EtherCAT Network Diagnostic
Procedure on page 9-4.
Overlength
frames
received
The number of frames
received with more than
1,522 bytes.
The frames on the EtherCAT network
are corrupted due to noise. Comput-
ers or other non-EtherCAT devices
are connected.
Refer to EtherCAT Network Diagnostic
Procedure on page 9-4.
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