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4. SAFETY OBSERVATION FUNCTION
4.5 Safety observation function
4.5.1 STO function
(1) Summary
Shuts off servo motor drive energy electronically with based on an input signal from an external device
(secondary-side output shut-off). This corresponds to stop category 0 of IEC 60204-1. The STO function
is also used for an emergency stop when an error is detected in internal diagnosis. Use the STO
function while the servo motor stops.
(2) Operation sequence
(a) STOC (STO command)
Turn off STOC (STO command) only when the servo motor stops after servo off. The STO function
will operate by turning off STOC (STO command). While STO is in operation, power to the servo
motor is shut off and the dynamic brake activates. Turning STOC (STO command) back to on will
return to normal operation.
Servo motor speed
SON (Servo-on)
or
servo-on command
STOC (STO command)
WNG (Warning)
Base circuit (Energy
supply to the servo
motor)
STOS (STO output)
4 - 21
Ordinary operation
50 r/min
0 r/min
ON
OFF
ON (disabled)
OFF (enabled)
ON (alarm)
OFF (no alarm)
ON
OFF
ON
OFF (shut-off)
STO status
Ordinary operation
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