Siemens SINUMERIK 840D sl Function Manual page 166

Safety Functions Integrated in the System/Drive
6.7 Safe software limit switches (SE)
Table 6-20 Explanation of the diagram
Time Explanation
t Time until the stop response that was initiated actually starts
5
STOP C: typical 2 position controller clock cycles, maximum 2 position controller clock cycles
STOP D/E: typical 2 interpolation clock cycles, maximum 2 interpolation clock cycles + 2 moni-
toring clock cycles
t Time required to bring the axis to a standstill.
6
This time and thus the residual distance traveled by the axis is determined by the axis design
(motor, mass, friction, ...) and the configured stop response (STOP C is faster than STOP D).
Note:
Each axis must be measured during commissioning (start–up) to determine the distance that it travels
between the limit switch being violated and it coming to a standstill.
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SINUMERIK 840D sl/SINAMICS S120 SINUMERIK Safety Integrated (FBSI sl) – 05.2008 Edition
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05.08