Siemens Sinamics S110 Function Manual page 303

Functional features of "Safe Brake Control" (SBC)
● When "Safe Torque Off" is selected or when safety monitors are triggered, "SBC" is
● Unlike conventional brake control, SBC is executed via p1215 through two channels.
● SBC is executed regardless of the brake control or mode set in p1215. SBC is not
● The function must be enabled via parameter.
● Each time "Safe Torque Off" is selected, the holding brake is applied immediately with
Enabling the "Safe Brake Control (SBC)" function
The "Safe Brake Control" function is enabled via the following parameters:
● p9602 SI enable safe brake control (Control Unit)
● p9802 SI enable safe brake control (Power Module)
The "Safe Brake Control" function is not selected until at least one safety monitoring function
has been enabled (i.e. p9601 = p9801 ≠ 0).
Two-channel brake control
The function "Safe Brake Control" is carried out using a two-channel method, in which both
the plus-potential (24 V) leading and the ground-potential leading brake connection are
connected to the Safe Brake Relay.
The brake diagnosis can only reliably detect a malfunction in either of the switches in the
Safe Brake Relay when the status changes (when the brake is released or applied).
If the Safe Brake Relay or its controller detects a fault, the brake current is switched off and a
safe status is reached.
Response time with the "Safe Brake Control" function
For the response times when the function is selected/deselected via input terminals, see the
table in "Response times".
Example
Assumption:
Safety monitoring clock cycle time CU (r9780) = 2 ms and
inputs/outputs sampling time = 4 ms
t
R_typ
t
R_max
Parameter overview (see SINAMICS S110 List Manual)
● r9780 SI monitoring clock cycle (Control Unit)
● r9880 SI monitoring clock cycle (Power Module)
Drive functions
Function Manual, 10/2008, 6SL3097-4AB10-0BP0
performed with safe pulse suppression.
recommended, however, when 1215 = 0 or 3.
forced dormant error detection.
= 4 x r9780 (2 ms) + 4 ms = 12 ms
= 8 x r9780 (2 ms) + 4 ms = 20 ms
Safety Integrated Functions
8.4 Basic Functions
303