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7-2
7-1 Safe Torque OFF (STO) Function
OMNUC G5-Series AC Servo Drives Users Manual (Built-in MECHATROLINK-II communications type)
7
Safety Function
I/O Signal Specifications
Safety Input Signal
There are 2 types of safety input circuits to operate the STO function.
When the safety input is either 1 or 2, the STO function starts operating within 5 ms of the input,
and the motor output torque will be reduced to 0.
Connect the equipment so that the safety input circuit is turned OFF when you operate the STO
function.
Use Stop Selection for Alarm Detection (Pn510) to set the operation when the safety input is
turned OFF.
Precautions for Correct Use
L-pulse for self-diagnosis of safety equipment
When you are connecting a safety equipment, such as a Safety Controller or a safety sensor, the
safety output signal of the equipment may include L pulse for self-diagnosis. To avoid malfunction
due to this L-pulse for self-diagnosis, a filter that can remove the L pulse for self-diagnosis is built in
with the safety input circuit. If the OFF time of the safety input signal is 1 ms or less, the safety input
circuit does not recognize it as OFF. To make sure that OFF is recognized, maintain the OFF status
of safety input signal for at least 5 ms.
Signal name
Symbol
Pin
number
Description
CONTROL mode
Position Speed Torque
Full
closing
Safety input 1
SF
CN8-4
• The upper arm drive signal of the
power transistor inside the Servo
Drive is cut off.
SF
CN8-3
Safety input 2
SF2
CN8-6
• The lower arm drive signal of the
power transistor inside the Servo
Drive is cut off.
SF2
CN8-5
For self-diagnosis
L pulse
Within 1 ms
Within 5 ms
Normal operation
STO status
Safety input signal
Servo amplifier operation
5 ms or more
Содержание OMNUC G5 R88D-KN series
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