user@debian:~$ sudo dmesg | grep EtherCAT
[    5.368363] EtherCAT: Master driver 1.6.2 1.6.2.g285cdf0-1+12.2
[    5.368506] EtherCAT: 1 master waiting for devices.
[    5.395722] ec_generic: EtherCAT master generic Ethernet device module 1.6.2 1.6.2.g285cdf0-1+12.2
[    5.395736] EtherCAT: Accepting 00:23:24:49:24:E6 as main device for master 0.
[    5.425990] EtherCAT 0: Starting EtherCAT-IDLE thread.
[  544.378000] EtherCAT 0: Link state of ecm0 changed to UP.
[  544.389990] EtherCAT 0: 1 slave(s) responding on main device.
[  544.389996] EtherCAT 0: Slave states on main device: INIT.
[  544.390359] EtherCAT 0: Scanning bus.
[  544.579766] EtherCAT ERROR 0-0: SDO upload 0x0000:00 aborted.
[  544.579770] EtherCAT ERROR 0-0: SDO abort message 0x06020000: "This object does not exist in the object directory".
[  544.579772] EtherCAT ERROR 0-0: Failed to read number of mapped PDO entries.
[  544.579773] EtherCAT ERROR 0-0: Failed to read mapped PDO entries for PDO 0x0000.
[  544.616529] EtherCAT ERROR 0-0: SDO upload 0x0000:00 aborted.
[  544.616532] EtherCAT ERROR 0-0: SDO abort message 0x06020000: "This object does not exist in the object directory".
[  544.616534] EtherCAT ERROR 0-0: Failed to read number of mapped PDO entries.
[  544.616535] EtherCAT ERROR 0-0: Failed to read mapped PDO entries for PDO 0x0000.
[  544.616536] EtherCAT 0: Bus scanning completed in 224 ms.
[  544.616538] EtherCAT 0: Using slave 0 as DC reference clock.
[  544.622079] EtherCAT 0: Slave states on main device: PREOP.
[ 1754.918085] EtherCAT 0: 2 slave(s) responding on main device.
[ 1754.918094] EtherCAT 0: Slave states on main device: INIT, PREOP.
[ 1754.918543] EtherCAT 0: Scanning bus.
[ 1755.096049] EtherCAT ERROR 0-0: SDO upload 0x0000:00 aborted.
[ 1755.096052] EtherCAT ERROR 0-0: SDO abort message 0x06020000: "This object does not exist in the object directory".
[ 1755.096054] EtherCAT ERROR 0-0: Failed to read number of mapped PDO entries.
[ 1755.096055] EtherCAT ERROR 0-0: Failed to read mapped PDO entries for PDO 0x0000.
[ 1755.132792] EtherCAT ERROR 0-0: SDO upload 0x0000:00 aborted.
[ 1755.132794] EtherCAT ERROR 0-0: SDO abort message 0x06020000: "This object does not exist in the object directory".
[ 1755.132795] EtherCAT ERROR 0-0: Failed to read number of mapped PDO entries.
[ 1755.132795] EtherCAT ERROR 0-0: Failed to read mapped PDO entries for PDO 0x0000.
[ 1755.322621] EtherCAT ERROR 0-1: SDO upload 0x0000:00 aborted.
[ 1755.322625] EtherCAT ERROR 0-1: SDO abort message 0x06020000: "This object does not exist in the object directory".
[ 1755.322626] EtherCAT ERROR 0-1: Failed to read number of mapped PDO entries.
[ 1755.322627] EtherCAT ERROR 0-1: Failed to read mapped PDO entries for PDO 0x0000.
[ 1755.359360] EtherCAT ERROR 0-1: SDO upload 0x0000:00 aborted.
[ 1755.359361] EtherCAT ERROR 0-1: SDO abort message 0x06020000: "This object does not exist in the object directory".
[ 1755.359363] EtherCAT ERROR 0-1: Failed to read number of mapped PDO entries.
[ 1755.359363] EtherCAT ERROR 0-1: Failed to read mapped PDO entries for PDO 0x0000.
[ 1755.359364] EtherCAT 0: Bus scanning completed in 440 ms.
[ 1755.359366] EtherCAT 0: Using slave 0 as DC reference clock.
[ 1755.366123] EtherCAT 0: Slave states on main device: PREOP.
[ 1921.946067] EtherCAT 0: Slave states on main device: PREOP, OP.
[ 1921.990171] EtherCAT 0: Slave states on main device: OP.
[ 2617.045218] EtherCAT: Requesting master 0...
[ 2617.045223] EtherCAT: Successfully requested master 0.
[ 2617.045459] EtherCAT 0: Domain0: Logical address 0x00000000, 52 byte, expected working counter 6.
[ 2617.045462] EtherCAT 0:   Datagram domain0-0-main: Logical offset 0x00000000, 52 byte, type LRW.
[ 2617.045475] EtherCAT 0: Master thread exited.
[ 2617.045477] EtherCAT 0: Starting EtherCAT-OP thread.
[ 2617.166143] EtherCAT 0: Slave states on main device: PREOP, OP.
[ 2676.994658] EtherCAT 0: Master thread exited.
[ 2676.994669] EtherCAT 0: Starting EtherCAT-IDLE thread.
[ 2676.994744] EtherCAT 0: Releasing master...
[ 2676.994746] EtherCAT 0: Released.
[ 2676.994890] EtherCAT ERROR 0-0: Failed to receive AL state datagram: Datagram initialized.
[ 2677.050103] EtherCAT 0: Slave states on main device: PREOP.
[ 2677.510171] EtherCAT WARNING: Datagram 000000009b53c4cd (master-fsm) was SKIPPED 1 time.
[ 2678.646621] EtherCAT: Requesting master 0...
[ 2678.646626] EtherCAT: Successfully requested master 0.
[ 2678.646862] EtherCAT 0: Domain0: Logical address 0x00000000, 52 byte, expected working counter 6.
[ 2678.646865] EtherCAT 0:   Datagram domain0-0-main: Logical offset 0x00000000, 52 byte, type LRW.
[ 2678.646878] EtherCAT 0: Master thread exited.
[ 2678.646881] EtherCAT 0: Starting EtherCAT-OP thread.
[ 2678.646924] EtherCAT WARNING 0: 1 datagram UNMATCHED!
[ 2678.774065] EtherCAT 0: Slave states on main device: PREOP, OP.
[ 5443.759005] EtherCAT 0: Link state of ecm0 changed to DOWN.
[ 5443.774155] EtherCAT ERROR 0-0: Failed to receive AL state datagram: Datagram error.
[ 5443.782154] EtherCAT 0: 0 slave(s) responding on main device.
[ 5444.670152] EtherCAT WARNING 0: 1 datagram TIMED OUT!
[ 6283.319733] EtherCAT 0: Master thread exited.
[ 6283.319747] EtherCAT 0: Starting EtherCAT-IDLE thread.
[ 6283.319845] EtherCAT 0: Releasing master...
[ 6283.319849] EtherCAT 0: Released.
[ 6283.634237] EtherCAT WARNING: Datagram 000000009b53c4cd (master-fsm) was SKIPPED 1 time.
[ 6290.499811] EtherCAT: Requesting master 0...
[ 6290.499815] EtherCAT: Successfully requested master 0.
[ 6290.500058] EtherCAT 0: Domain0: Logical address 0x00000000, 52 byte, expected working counter 6.
[ 6290.500062] EtherCAT 0:   Datagram domain0-0-main: Logical offset 0x00000000, 52 byte, type LRW.
[ 6290.500077] EtherCAT 0: Master thread exited.
[ 6290.500079] EtherCAT 0: Starting EtherCAT-OP thread.
[ 6290.846416] EtherCAT 0: Master thread exited.
[ 6290.846426] EtherCAT 0: Starting EtherCAT-IDLE thread.
[ 6290.846484] EtherCAT 0: Releasing master...
[ 6290.846486] EtherCAT 0: Released.
[ 6291.682283] EtherCAT WARNING: Datagram 000000009b53c4cd (master-fsm) was SKIPPED 1 time.
[ 6310.140381] EtherCAT: Requesting master 0...
[ 6310.140385] EtherCAT: Successfully requested master 0.
[ 6310.140620] EtherCAT 0: Domain0: Logical address 0x00000000, 52 byte, expected working counter 6.
[ 6310.140623] EtherCAT 0:   Datagram domain0-0-main: Logical offset 0x00000000, 52 byte, type LRW.
[ 6310.140646] EtherCAT 0: Master thread exited.
[ 6310.140648] EtherCAT 0: Starting EtherCAT-OP thread.
[ 6328.578935] EtherCAT 0: Master thread exited.
[ 6328.578948] EtherCAT 0: Starting EtherCAT-IDLE thread.
[ 6328.579030] EtherCAT 0: Releasing master...
[ 6328.579032] EtherCAT 0: Released.
[ 6328.910204] EtherCAT WARNING: Datagram 000000009b53c4cd (master-fsm) was SKIPPED 1 time.
[ 6592.306211] EtherCAT 0: Link state of ecm0 changed to UP.
[ 6592.318223] EtherCAT 0: 2 slave(s) responding on main device.
[ 6592.318232] EtherCAT 0: Slave states on main device: INIT.
[ 6592.318727] EtherCAT 0: Scanning bus.
[ 6592.508615] EtherCAT ERROR 0-0: SDO upload 0x0000:00 aborted.
[ 6592.508619] EtherCAT ERROR 0-0: SDO abort message 0x06020000: "This object does not exist in the object directory".
[ 6592.508621] EtherCAT ERROR 0-0: Failed to read number of mapped PDO entries.
[ 6592.508622] EtherCAT ERROR 0-0: Failed to read mapped PDO entries for PDO 0x0000.
[ 6592.545492] EtherCAT ERROR 0-0: SDO upload 0x0000:00 aborted.
[ 6592.545496] EtherCAT ERROR 0-0: SDO abort message 0x06020000: "This object does not exist in the object directory".
[ 6592.545498] EtherCAT ERROR 0-0: Failed to read number of mapped PDO entries.
[ 6592.545499] EtherCAT ERROR 0-0: Failed to read mapped PDO entries for PDO 0x0000.
[ 6592.734629] EtherCAT ERROR 0-1: SDO upload 0x0000:00 aborted.
[ 6592.734634] EtherCAT ERROR 0-1: SDO abort message 0x06020000: "This object does not exist in the object directory".
[ 6592.734636] EtherCAT ERROR 0-1: Failed to read number of mapped PDO entries.
[ 6592.734637] EtherCAT ERROR 0-1: Failed to read mapped PDO entries for PDO 0x0000.
[ 6592.771452] EtherCAT ERROR 0-1: SDO upload 0x0000:00 aborted.
[ 6592.771455] EtherCAT ERROR 0-1: SDO abort message 0x06020000: "This object does not exist in the object directory".
[ 6592.771456] EtherCAT ERROR 0-1: Failed to read number of mapped PDO entries.
[ 6592.771457] EtherCAT ERROR 0-1: Failed to read mapped PDO entries for PDO 0x0000.
[ 6592.771458] EtherCAT 0: Bus scanning completed in 452 ms.
[ 6592.771460] EtherCAT 0: Using slave 0 as DC reference clock.
[ 6592.778254] EtherCAT 0: Slave states on main device: PREOP.