Emergency Stop Control Elements - Siemens SINUMERIK 840D sl Function Manual

N2: Emergency stop

11.3 Emergency stop control elements

Hazards
In the terms of EN 418, risks may arise from:
● Functional irregularities (machine malfunctions, unacceptable properties of the material to
be machined, human error, etc.).
● Normal operation.
Stadard EN ISO 12000-2
In accordance with the basic safety requirement of the EC Machinery Directive regarding
emergency stop, machines must be equipped with an energency stop device.
Exceptions
No emergency stop device is required on machines:
● Where an emergency stop device would not reduce the risk, either because the shutdown
time would not be reduced or because the measures to be taken would not be suitable for
controlling the risk.
● That are held and operated manually.
Note
The machine manufacturer is expressly directed to comply with the national and
international standards. The SINUMERIK controllers support the machine manufacturer in
the implementation of the emergency stop function according to the specifications in the
following function description. But the responsibility for the emergency stop function (its
triggering, sequence and acknowledgement) rests exclusively with the machine
manufacturer.
11.3 Emergency stop control elements
Emergency stop control elements
In accordance with EN 418, emergency stop control elements must be designed so that they
latch mechanically on their own and are easy for the operator and others to actuate in the
event of an emergency.
The following list includes some possible types of control elements:
● Mushroom pushbutton switches
● Wires/cables, cords, rods
● Puller grips
● In special cases: Foot switches without protective covers
804
Function Manual, 01/2015, 6FC5397-0BP40-5BA2
Basic Functions