Siemens SINAMICS S120 Function Manual page 600

Safety Integrated basic functions
10.6 Safe Brake Control (SBC)
Enabling the "Safe Brake Control" function
The "Safe Brake Control" function is enabled via parameter p9602.
The SBC function can be used only together with STO. The selection of SBC alone is not
possible.
Two-channel brake control
Note
Connecting the brake
The brake cannot be directly connected to the Motor Module in chassis format: A Safe Brake
Adapter is also required.
The brake is essentially controlled from the Control Unit. Two signal paths are available for
applying the brake.
Figure 10-1
For the "Safe Brake Control" function, the Motor/Power Module assumes a monitoring
function to ensure that when the Control Unit fails or malfunctions, the brake current is
interrupted therefore closing the brake.
The brake diagnosis can only reliably detect a malfunction in either of the switches (TB+, TB-
) when the status changes, i.e. when the brake is released or applied.
If the Motor Module or Control Unit detects a fault, the brake current is switched off. The
brake then closes and a safe state is reached.
600
Two-channel brake control, blocksize (example)
Function Manual, (FH1), 04/2014, 6SL3097-4AB00-0BP4
Drive functions