Siemens SINUMERIK 840D sl Function Manual page 56

Safety Functions Integrated in the Drive
4.3 Safe brake control (SBC)
Response time for safe brake control function
The following values can be specified for the response times when the function is
selected/deselected via input terminals:
S Typical response time
4x safety monitoring clock cycle CU (r9780) + inputs/outputs, sampling time
(p0799)
S Maximum response time that can occur when an error develops
8x safety monitoring clock cycle CU (r9780) + inputs/outputs, sampling time
(p0799)
Examples:
Assumption:
Safety monitoring clock cycle CU (r9780) = 4 ms and inputs/outputs, sampling time
(r0799) = 4 ms
t = 4x r9780 (4 ms) + r0799 (4 ms) = 20 ms
R_type
t = 8x r9780 (4 ms) + r0799 (4 ms) = 36 ms
R_max
Parameter overview (see Subsection 8.2.1 "Overview of parameters")
S p0799
S r9780
S r9880
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SINUMERIK 840D sl/SINAMICS S120 SINUMERIK Safety Integrated (FBSI sl) – 03.2006 Edition
"CU inputs/outputs, sampling time"
"SI monitoring clock cycle (Control Unit)"
"SI monitoring clock cycle (Motor Module)"
© Siemens AG, 2006. All rights reserved
03.06