Emergency Stop Sequence - Siemens SINUMERIK 840D sl Function Manual

Emergency stop button and control
Actuation of the emergency stop button or a signal derived directly from the button must be
routed to the controller (PLC) as a PLC input. In the PLC user program, this PLC input must
be forwarded to the NC on the interface signal:
DB10 DBX56.1 (Emergency stop)
Resetting of the emergency stop button or a signal derived directly from the button must be
routed to the controller (PLC) as a PLC input. In the PLC user program, this PLC input must
be forwarded to the NC on the interface signal:
DB10 DBX56.2 (Acknowledge emergency stop)
Connection conditions
For connecting the emergency stop button see:
References:
Operator Components Manual
11.4

Emergency stop sequence

After actuation of the emergency stop control element, the emergency stop device must
operate in the best possible way to prevent or minimize the danger.
"In the best possible way" means that the most favorable delay rate can be selected and the
correct stop category (defined in EN 60204) can be determined according to a risk assessment.
Emergency stop sequence in the NC
The predefined (in EN 418) sequence of internal functions implemented to obtain the
emergency stop state is as follows in the control system:
1. Part program execution is interrupted.
All machine axes are braked in the relevant axis-specific parameterized time:
MD36610 $MA_AX_EMERGENCY_STOP_TIME (time of braking ramp in event of
errors)
The maximum braking ramp that can be achieved thereby, is defned by the maximum brake
current of the respective drive. The maximum brake current is achieved by setting a setpoint
= 0 (fast braking).
2. Reset interface signal:
DB11 DBX6.3 (Mode group ready)
3. Set the interface signal:
DB10 DBX106.1 (emergency stop active)
4. Alarm 3000 "Emergency stop" is displayed.
Basic Functions
Function Manual, 01/2015, 6FC5397-0BP40-5BA2
N2: Emergency stop
11.4 Emergency stop sequence
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