Siemens SIMATIC S7-300 Getting Started page 88

Trial run
Action
7 Emergency stop actuated while positioning
is running.
I 8.2 = FALSE (emergency stop)
8 Trigger emergency stop
I 8.2 = TRUE (emergency off)
9 Acknowledge and reintegrate fail-safe I/Os
I 8.5 = TRUE (trigger edge) > FALSE
10 Acknowledge technology
I 0.1 = TRUE (trigger edge) > FALSE
Safe Stop 2 (SS2) trial run
If you open the safety door during operation without actuation of the commissioning key
switch, the drive will brake autonomously on the OFF3 ramp until standstill (SS2) and will
change into a securely monitored position-controlled operation (Safe Operating Stop = SOS)
after reaching a standstill. The drive may be in position control, but a motion out of a
specified monitoring window would result in a safe reaction of the drive.
Action
1 Activate position control
I 0.0 = TRUE
2 Start positioning at 0.0
I 0.3 = TRUE (trigger edge) > FALSE
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 Acknowledge technology
I 0.1 = TRUE (trigger edge) > FALSE
88
Reaction
Drive is slowed to a standstill according to
OFF3 ramp and the drive is set to zero torque.
Q 24.2 = TRUE (emergency stop/safety door
active)
Q 24.3 = TRUE
(safety acknowledgment required)
Q 24.2 = FALSE
Q 24.3 = FALSE
Q 4.1 = TRUE (reset done)
Reaction
Q 4.0 = TRUE (position control active)
Drive moves in negative direction
Drive is slowed to a standstill according to
OFF3 and the drive remains under control.
Q 24.2 = TRUE
(emergency stop/safety door active)
Q 24.3 = TRUE
(safety acknowledgment required)
Q 24.2 = FALSE
Q 24.3 = FALSE
Q 4.1 = TRUE (reset done)
CPU 317TF-3PN/DP: Controlling a SINAMICS S120 with Safety Functions
Explanation
SS1 and STO will
become active
Acknowledgment of
emergency stop
required
No safety event
pending
No technology alarms
pending
Explanation
Drive enters position
control
SS2 and SOS are
active
Acknowledgment of
safety door required
No safety event
pending
No technology alarms
pending
Getting Started, 10/2013, A5E02982990-04