Basic logic functions: Emergency Stop (N2)
Function Manual, 11/2006, 6FC5397-0BP10-2BA0
5
Brief Description
1
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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