Siemens SINUMERIK 840D sl Function Manual page 950

Detailed description
2.2 Emergency stop control elements
Exceptions
No emergency stop device is required on machines:
• Where an emergency stop device would not reduce the risk, either because the shutdown
• that are held and operated manually.
Notice
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 acknowledgment) rests exclusively with the machine
manufacturer.
2.2 Emergency stop control elements
EN standard
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:
• Mushroomhead pushbutton switches
• Wires/cables, cords, rods
• Puller grips
• In special cases: Footoperated switches without protective covers
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).
8
time would not be reduced or because the measures to be taken would not be suitable for
controlling the risk.
Basic logic functions: Emergency Stop (N2)
Function Manual, 11/2006, 6FC5397-0BP10-2BA0