N2: Emergency Stop; Brief Description; Relevant Standards - Siemens SINUMERIK 840D sl Function Manual

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.
● The Emergency Stop function must bring the machine to a standstill according to stop
category 0 or 1 (EN 60204).
● 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.
11.2

Relevant standards

Relevant standards
Compliance with the following standards is essential for the emergency stop function:
● EN ISO 12000-1
● EN ISO 12000-2
● EN 418
● EN 60204
Emergency stop
In accordance with EN 418, an emergency stop is a function that:
● Is intended to prevent or diminish developing or existing risks to operating personnel, and
damage to the machine or machined materials.
● Is triggered by a single action of a person, if the normal stop function is not suitable for it.
Basic Functions
Function Manual, 01/2015, 6FC5397-0BP40-5BA2
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