1.2.4.5.1 Emergency stop
The STO and SBC functions can be used for implementing the category 0 emergency stop function according
to IEC 60204-1:2016.
The Emergency stop function can be realized
With an emergency stop switch connected directly to control the STO-SBC input signals
With an emergency stop relay + emergency stop switch.
With safety PLC + emergency stop switch.
Please read the section about the
working principle of the Safety circuit
.
All cases above requires correct behaviour from the controlling PLC. After releasing the emergency stop
device, a separate and deliberate action must be used to restart the system (restarting can be done with a
non-safety PLC).
Attention
IEC 60204-1:2016 requires “reset shall not initiate a restart” regarding emergency stop.
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