12.2 Hard Wire Base Block (HWBB and SBB)
12.2.8 /S-RDY (Servo Ready Output) Signal
12-9
12
Safety Functions
12.2.8
/S-RDY (Servo Ready Output) Signal
The Servo ON command (Enable Operation command) will not be acknowledged in the HWBB
state. Therefore, the Servo Ready Output Signal will turn OFF. The Servo Ready Output Signal
will turn ON if both the /HWBB1 and /HWBB2 signals are ON and the servo is turned OFF (BB
state).
An example is provided below for when the main circuit power supply is ON when there is no
servo alarm.
12.2.9
/BK (Brake Output) Signal
If the HWBB operates when the /HWBB1 or /HWBB2 signal is OFF, the /BK (Brake) signal will
turn OFF. At that time, the setting in Pn506 (Brake Reference - Servo OFF Delay Time) will be
disabled. Therefore, the Servomotor may be moved by external force until the actual brake
becomes effective after the /BK signal turns OFF.
Controlword (6040h)
Enable
Operation
Shutdown
/HWBB1
/HWBB2
OFF
ON (normal
operation)
SERVOPACK
Status
/S-RDY (Servo
Ready Output
Signal)
Operating
Status
ON
HWBB state
BB state
ON
OFF (motor current
shut-OFF request)
ON (normal
operation)
CAUTION
The brake signal is not a safety-related element. You must design the system so that a haz-
ardous condition does not occur even if the brake signal fails in the HWBB state. Also, if a
Servomotor with a Brake is used, keep in mind that the brake in the Servomotor is used only
to prevent the moving part from being moved by gravity or an external force and it cannot
be used to stop the Servomotor.
