Appendices
A - 108
AC Servomotors/Servo Drives 1S-series with Built-in EtherCAT® Communications User’s Manual (I586)
78210000 Brake Interlock Error The Brake Interlock Output 
(BKIR) was output by the 
Timeout at Servo OFF.
• The Brake Interlock Output 
(BKIR) was output because 
the motor rotation speed did 
not decrease to or less than 
the speed set in the Thresh-
old Speed at Servo OFF 
within the time set in the 
Timeout at Servo OFF 
when Servo OFF was per-
formed during the motor 
operation
√ P. A-157
78230000 Command Error A mistake was made in 
using a command.
• When bit 9 (Remote) of the 
Statusword was set to 1 
(remote), and the Servo 
Drive was in Operation 
enabled state (Servo ON), 
the Servo Drive received a 
command to change the 
communications state from 
Operational to another state 
(Init, Pre-Operational, or 
Safe-Operational)
• A mode of operation other 
than the hm mode was set 
during the homing operation
• Modes of operation was set 
to pp, pv or hm mode when 
the communications period 
was set to shorter than 
250 μs
√ P. A-158
84B10000 EtherCAT State 
Change Error
A communications state 
change command was 
received for which the cur-
rent communications state 
could not be changed.
• A communications state 
change command was 
received for which the cur-
rent communications state 
could not be changed
√ P. A-159
84B20000 EtherCAT Illegal 
State Change Error
An undefined communica-
tions state change com-
mand was received.
• An undefined communica-
tions state change com-
mand was received
√ P. A-159
84B40000 Synchronization 
Error
A signal for synchronous 
communications could not 
be detected.
•Noise
• Error of the EtherCAT slave 
communications controller
√ P. A-160
84B50000 Sync Manager WDT 
Error
PDO communications were 
interrupted for the allow-
able period or longer.
• An EtherCAT communica-
tions cable is disconnected, 
loose, or broken
• Host controller error
√ P. A-160
84B60000 ESC Initialization 
Error
The initialization of Ether-
CAT slave communications 
controller failed.
• Data was incorrectly over-
written in the non-volatile 
memory of the EtherCAT 
slave communications con-
troller
• Failure of the EtherCAT 
slave communications con-
troller
√ P. A-161
Event code 
(hex)
Event name Description Assumed cause
Level
Refer-
ence
Min
Obs
Info