Siemens SIMATIC S7-300 Getting Started page 89

Safely-Limited Speed (SLS) trial run
If you operate the commissioning key switch and then open the safety door, then the drive
will only travel at a safety-limited speed. If you exceed the speed, then the drive will switch to
a safe operating mode. If you open the safety door during travel with actuated
commissioning key switch, then the speed will be reduced automatically to a safe speed in
this sample program.
Action
1 Start positioning at 5000.0
I 0.4 = TRUE (trigger edge) > FALSE
2 Set key switch to commissioning
I 8.3 = TRUE (commissioning key switch)
3 Safety door open
I 8.0 = FALSE (SafetyDoor1)
I 8.2 = FALSE (SafetyDoor2)
4 Close safety door
I 8.0 = TRUE (SafetyDoor1)
I 8.2 = TRUE (SafetyDoor2)
5 Acknowledge and reintegrate fail-safe I/Os
I 8.5 = TRUE (trigger edge) > FALSE
6 After reaching position 5000.0
Diagnostics / correction of errors
Incorrect operator input, faulty wiring or inconsistent configuration data may lead to errors.
For information on how to analyze such errors and messages, refer to the
S7-Technology
CPU 317TF-3PN/DP: Controlling a SINAMICS S120 with Safety Functions
Getting Started, 10/2013, A5E02982990-04
Reaction
Drive moves in positive direction
No further reaction
Drive travels further in the positive direction,
but speed is reduced to safely limited speed.
Q 24.1 = TRUE (commissioning mode active)
Q 24.2 = TRUE (emergency stop/safety door
active)
Q 24.3 = TRUE (safety acknowledgment
required)
Drive travels further in positive direction and
increases its velocity to original value.
Q 24.2 = FALSE
Q 24.3 = FALSE
Q 4.4=TRUE (position 5000.0 reached)
(Q 4.6=TRUE if the same position is reached
while the speed is still reduced).
Manual.
Trial run
Explanation
SLS active
Acknowledgment of
safety door required
No safety event
pending
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