Siemens SINUMERIK 840D sl Function Manual page 165

05.08
Acknowledging and moving away
1. Withdraw the user agreement (SE is no longer active) or changeover to another SE.
2. Acknowledge the stop and alarm response.
3. Bring the axis into a range in which the monitoring no longer responds.
Timing when the safe software limit switches are actuated
If the "safe software limit switches" function is active, the system timing is as fol-
lows when the software limit switches are actuated (passed):
Fig. 6-15
Table 6-20 Explanation of the diagram
Time Explanation
t The position control clock cycle, defined by the following MDs:
1
for 840D sl:
MD 10050: $MN_SYSCLOCK_CYCLE_TIME
MD 10060: $MN_POSCTRL_SYSCLOCK_TIME_RATIO
t Monitoring clock cycle, defined by the following MDs:
2
for 840D sl:
MD 10090: $MN_SAFETY_SYSCLOCK_TIME_RATIO
for SINAMICS S120:
p9500: SI motion monitoring clock cycle (Control Unit)
t Delay until the configured stop response is output
3
(typical 0.5 monitoring clock cycles, maximum 1 monitoring clock cycle + 1 position controller
clock cycle)
t Time until the configured stop response becomes effective
4
(typical 1.5 monitoring clock cycles, maximum 2 monitoring clock cycles + 1 position controller
clock cycle)
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SINUMERIK 840D sl/SINAMICS S120 SINUMERIK Safety Integrated (FBSI sl) – 05.2008 Edition
n
a) the end position is passed
n
act
t
2
t
t
3
t
4
Timing when a software limit switch is actuated
Safety Functions Integrated in the System/Drive
6.7 Safe software limit switches (SE)
1
not to scale
t
5
t
6
t
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