A.2 EMERGENCY OFF and EMERGENCY STOP
Overvie
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In plants, systems and machines a distinction must be made between "EMERGENCY OFF" and
"EMERGENCY STOP".
The Safe Torque O (STO) Safety Integrated function is suitable for implementing an
"EMERGENCY STOP" but is not suitable for implementing an "EMERGENCY OFF".
Description of function
IEC60204‑1 denes "EMERGENCY OFF" and "EMERGENCY STOP":
• "EMERGENCY OFF" and "EMERGENCY STOP" are actions taken in an emergency.
• "EMERGENCY OFF" and "EMERGENCY STOP" reduce dierent risks in the machine or system:
– "EMERGENCY OFF" reduces the risk from electric shock.
– "EMERGENCY STOP" reduces the risk from unexpected movement.
Table A-1 The distinction between "EMERGENCY OFF" and "EMERGENCY STOP"
Action: EMERGENCY OFF EMERGENCY STOP
Stop category0 according to IEC60204‑1
Risk:
Electric shock
Unexpected motion
Measure to minimize risk: Switch o voltage
Switch o hazardous voltages completely
or in part
Prevent movement
Prevent any hazardous movement
Classic solution: Switch o the voltage: Switch o the power supply of the drive:
Appendix
A.2EMERGENCY OFF and EMERGENCY STOP
SINAMICS S200 PROFINET servo drive system with SIMOTICS S-1FL2
Operating Instructions, 11/2023, FW V6.3, A5E51646752B AB 689
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