Application Example Of Safety Functions - YASKAWA E-V Series User Manual

 Safety Function B
<When the Emergency Stop Switch Is Not Pressed>
The X1 signal of the Safety Controller is OFF and the S14 and the S24 signals are ON. Signals /SRI-B1 and 
/SRI-B2 are both ON and Safety Function B (SBB-D function) does not operate. Normal operation is exe-
cuted.
<When the Emergency Stop Switch Is Pressed>
The X1 signal of the Safety Controller turns ON and the S14 and the S24 signals turn OFF. Due to the state of
the X1 signal, the host controller switches from the normal operation reference to the deceleration reference to
stop. The motor is stopped and the servo is turned OFF. The Safety Module monitors the speed, and shuts OFF
the power supply to the motor after the specified Deceleration Monitoring Time (Pc21) has elapsed. EDM-B
turns ON when the power supply is shut OFF.
<When the Emergency Stop Switch Is Released>
The EDM-B signal is ON while no power is being supplied to the motor. If the emergency stop switch is
released in this state, the X1 signal turns OFF and the S14 and the S24 signals turn ON because the Safety
Controller is in the Auto Reset state. Due to the state of the X1 signal, the host controller switches to the nor-
mal operation reference, and normal operation is returned.
Emergency stop switch
X1 signal
Operation reference
SERVOPACK state
S14 signal, /SRI-B1
S24 signal, /SRI-B2
SBB-D function operation state
T31/T33 signal, EDM-B
(3) Checking the Operation of Safety Functions
When starting the system or replacing a SERVOPACK or a Safety Module for maintenance or inspection pur-
poses, be sure to check the following after performing wiring.
• When signals /SRI-A1 and /SRI-A2, or /SRI-B1 and /SRI-B2 are switched between ON and OFF, make sure
that the bits assigned to Un016 operate properly.
 For details on Un016, refer to 9.2.1 Safety Module I/O Signal Monitor (Un016).
 If the ON/OFF timing of the signals does not match or if the signals are not operating, the external wiring
may have been disconnected or there may be a short-circuit. Another possible reason is malfunctioning of
the safety equipment or SERVOPACK. Find the cause and take proper action.
• If signals /SRI-A1 and /SRI-A2, or /SRI-B1 and /SRI-B2 turn OFF, EDM-A or EDM-B must turn ON after
the specified time elapses. At this point, the status display on the SERVOPACK must be in the safe state.
• If signals /SRI-A1 and /SRI-A2, or /SRI-B1 and /SRI-B2 turn ON, the motor must operate properly accord-
ing to the reference from the host controller.
Operation Timing
Emergency stop switch Emergency stop switch
is not pressed
Deceleration
Normal operation reference
reference
Servo ON state
Deceleration
monitoring

6.8 Application Example of Safety Functions

Emergency stop switch
is pressed is released
Normal operation reference
Servo OFF state Servo ON state
Power shut OFF
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