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4. SAFETY OBSERVATION FUNCTION
(b) Alarm occurrence
The STO function operates also during alarm occurrence. While STO is in operation, power to the
servo motor is shut off and the dynamic brake activates. For alarms which activate STO, refer to
chapter 7. For returning to normal operation, refer to section 4.5.10.
The timing chart is for STO/DB stop method.
(c) STO shut-off during servo motor operation
Turn off STOC (STO command) only when the servo motor stops after servo off. [AL. 63 STO timing
error] occurs if STOC (STO command) is turned off during operation. Use the SS1 function when
decelerating at the same time.
(3) Parameter setting
Set the parameter referring to section 4.3.3. Set parameters referring to section 4.4.1 when using the
STO function with input devices, and section 4.4.3 when using the STO function with safety compatible
motion controller.
Additionally, when using STOS (STO output) with output devices, refer to 4.4.2 to set parameters.
Servo motor speed
ALM (Malfunction)
Base circuit (Energy
supply to the servo
motor)
STOS (STO output)
Servo motor speed
STOC
(STO command)
ALM (Malfunction)
Base circuit
(Energy supply to
the servo motor)
STOS (STO output)
4 - 22
Ordinary operation
50 r/min
0 r/min
ON (alarm)
OFF (no alarm)
ON
OFF
ON
OFF (shut-off)
Ordinary operation
50 r/min
0 r/min
ON (disabled)
OFF (enabled)
ON (alarm)
OFF (no alarm)
ON
OFF
ON
OFF (shut-off)
STO status
STO status
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