Basic Functions
Function Manual 09/2011, 6FC5397-0BP40-2BA0
817
11
N2: Emergency stop
11.1 Brief Description
Function
The control system supports the machine manufacturer in implementing an emergency stop function on the basis
of the following functions:
• An emergency stop button is installed in a location easily accessible to the machine operator on all
SINUMERIK machine control panels. The functionality of the emergency stop button includes the positive
opening of electrical switching contacts and a mechanical self-activating latching/locking.
• The emergency stop request to the NC is transmitted via the NC/PLC interface on the PLC.
• In response to an emergency stop command, the NC decelerates all axes and spindles as quickly as possible
(with setpoint value 0), i.e. braking at the current limit of the drives.
• In the case of an emergency stop, all machine functions controlled by the PLC can be brought to a safe state
that can be set by the machine manufacturer.
• Unlatching the emergency stop button does not cancel the emergency stop state nor does it initiate a restart.
• After the emergency stop state has been canceled, it is not necessary to reference the machine axes or
synchronize the spindles. The actual positions of the machine axes are continuously tracked during the
emergency stop sequence.
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