Omron Sysmac NJ Series User Manual page 212

9 Troubleshooting
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.
Displayed informa-
Item
Frame reception The number of frame
timeout count reception timeouts
that occurred.
Reception buffer The number of
overflow count frames discarded due
to buffer overflows
when receiving data.
Non-EtherCAT The number of
frames received frames received other
than EtherCAT
frames.
Link OFF count The number of times
link OFF was detect-
ed.
Discarded process The number of proc-
data receptions ess data packets dis-
carded when receiv-
ing process data.
Discarded mes- The number of mes-
sage receptions sages discarded in
mailbox reception.
CRC error frames The number of
received frames received that
resulted in CRC er-
rors.
Frame reception The number of
errors frames resulting in re-
ception errors from
the Ethernet control-
ler (EtherMAC).
9-14
Assumed cause of increase
tion
A cause to a Process Data
Reception Timeout error occurred.
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.
There are too many frames on the
EtherCAT network that are not Ether-
CAT frames.
There are frames on the EtherCAT
network that are not EtherCAT
frames.
A cause to a Link OFF Error
(84200000 hex) event occurred.
Operations for which multi-execution
is prohibited in 9-3-2 Prohibition to
Physically Disconnecting a Slave
and Resetting an Error or Connect-
ing a Slave at the Same Time on
page 9-25 were executed.
The value sometimes increases
when the network is started or com-
municating EtherCAT slaves are re-
placed.
A cause to an EtherCAT Message
Error (842D0000 hex) or Illegal
Mailbox Received (84350000 hex)
event occurred.
The frames on the EtherCAT net-
work are corrupted.
The frames on the EtherCAT net-
work are corrupted due to noise.
NJ/NX-series CPU Unit Built-in EtherCAT Port User's Manual (W505)
Possible correction
Refer to EtherCAT Network Diagnos-
tic Procedure on page 9-3.
See if there are computers or other
non-EtherCAT devices connected to
the EtherCAT network and remove
them if there are any.
See if there are computers or other
non-EtherCAT devices connected to
the EtherCAT network and remove
them if there are any.
Refer to a Link OFF Error (84200000
hex) event in the NJ/NX-series
Troubleshooting Manual (Cat. No.
W503) and remove the cause of the
error.
Refer to 9-3-2 Prohibition to Physi-
cally Disconnecting a Slave and Re-
setting an Error or Connecting a
Slave at the Same Time on page
9-25.
Refer to an EtherCAT Message Error
(842D0000 hex) or Illegal Mailbox
Received (84350000 hex) event in
the NJ/NX-series Troubleshooting
Manual (Cat. No. W503) and remove
the cause of the error.
Refer to EtherCAT Network Diagnos-
tic Procedure on page 9-3.
Implement noise countermeasures.
Refer to 4-2-1 Installation Precau-
tions on page 4-12 for details.