Sequence diagram
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STO is selected during operation via the control bit of the selected PROFIsafe telegram or via the
F-DI.
Safe Brake Control (SBC) is activated at the same time. Taking the brake closing time (r1217)
into account, the command to close the motor holding brake closes the brake, thus supporting the
shutdown process initiated by STO.
The mechanical brake brakes the motor down to standstill.
The converter goes into the "Ready to start" state, when STO is deselected via PROFIsafe or F-
DI. SBC is reset at the same time. The brake remains (unsafely) closed until the standard program
executes the command to open the brake.
The converter switches the motor on again with a positive signal edge at ON/OFF.
Taking the brake opening time (r1216) into account, the command to open the motor holding brake
opens the brake.
The converter carries out a check to ensure that the "Safe Brake Control" function is working
properly and ensures that - if there is a failure or fault - the brake current is interrupted and the
brake is thus applied. 　 If a fault is detected by the converter, the brake current is
disconnected. The brake then closes and a safe state is reached.
Safety functions integrated in the drive
4.2 Basic Functions
SINAMICS S210 servo drive system
62 Operating Instructions, 12/2017, A5E41702836B AA
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