1.2.5 Safety functions (STO-SBC)
SOMANET Circulo provides two drive integrated safety functions according to EN 61800-5-2:2017 as a pure
hardware solution
1. STO (Safe Torque Off) prevents the creation of torque in the motor and enables an uncontrolled stop in
accordance with stop category 0 of IEC 60204-1:2016.
2. SBC (Safe Brake Control) prevents electrical current to be supplied to the brake output and thus safely
closes the external brake.
Attention
The safety circuit safely inhibits currents to the motor and to a brake when STO-SBC command has been
given (e.g. from an emergency stop device).
When the command has been released (e.g. manually resetting the emergency stop device) the currents
are allowed to be carried to the motor and to the brake.
The safety system must be designed to meet the requirement “restarting the machinery after a
stoppage must be possible only by an intended actuation of a control device provided for the purpose”.
Specifications of the safety functions
Safety connectors
Wiring the safety inputs
Using the safety functions
Examples for realising safety functions
Emergency stop
Stop category 1 emergency stop (Safe stop 1)
Prevention of unexpected start-up
Commissioning and maintenance
Changelog of the safety-related documentation
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