Siemens SINUMERIK 840D sl Function Manual page 65

Enabling the Safe Brake Control (SBC) function
The Safe Brake Control function is enabled using the following parameters:
● p9602 "SI enable Safe Brake Control (Control Unit)"
● p9802 "SI enable Safe Brake Control (Motor Module)"
The Safe Brake Control function is only selected if at least one safety monitoring function is
enabled (i.e. p9601 = p9801 ≠ 0).
Two-channel brake control
Note
When the "Safe Brake Control" function is used, then it is not permissible that the brake is
controlled through a relay, as this can result in faults being triggered in the brake control.
Note
The brake cannot be directly connected to the Motor Module in the chassis format. The
connection terminals are only designed for 24 VDC with 150 mA; the Safe Brake Adapter is
required for higher currents and voltages.
The brake is controlled from the Control Unit. Two signal paths are available for applying the
brake.
Figure 5-1
The Motor Module carries out a check to ensure that the "Safe Brake Control" function is
working properly and ensures that, if the Control Unit fails or is faulty, the brake current is
interrupted, therefore closing the brake.
The brake diagnostics can only reliably detect a malfunction in either of the switches (TB+,
TB-) when the status changes (when the brake is opened or closed).
If the Motor Module or Control Unit detects a fault, the brake current is switched off and the
safe status is reached.
Safety Integrated
Function Manual, 12/2017, 6FC5397-4BP40-6BA1
Two-channel brake control, booksize (example)
Safety Functions integrated in the drive
5.5 Safe Brake Control (SBC)
65