Siemens SINUMERIK 840D sl Function Manual page 153

03.06
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 Withdraw the user agreement (SE is no longer active) or changeover to another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 a safe software limit switch is actuated
If the "safe software limit switch" function is active, the system timing is as follows
when the software limit switch is 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
t Delay until the configured stop response is output (typical 0.5 monitoring clock cycles,
3
maximum 1 monitoring clock cycle + 1 position controller clock cycle)
t Time until the configured stop response becomes effective (typical 1.5 monitoring clock cycles,
4
maximum 2 monitoring clock cycles + 1 position controller clock cycle)
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
monitoring clock cycles
© Siemens AG, 2006. All rights reserved
SINUMERIK 840D sl/SINAMICS S120 SINUMERIK Safety Integrated (FBSI sl) – 03.2006 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
6-153