Safety Integrated Basic Functions
10.5 Safe Stop 1 (SS1, time controlled)
Drive functions
Function Manual, 11/2017, 6SL3097-4AB00-0BP5
687
In drive line-ups (e.g. drives that are mechanically connected via the material), the drive-
independent braking on the respective OFF3 ramp can cause problems. If the SS1E function
is used, the safe delay time (p9652) is started when the function is selected, but no OFF3 is
triggered. The higher-level controller still enters the setpoint. The controller receives the
information that SS1E has been selected via the Safety Info Channel.
Axis motion that is not monitored
During the unmonitored delay time, for "Safe Stop 1 (time-controlled) with external stop",
axis motion is possible that is not monitored. This motion can result in death or severe
injury.
• If there is a hazard due to unwanted movement in your application, take measures to
counter it, for example, by using a brake with safe monitoring. For more information, see
Chapter "Safe Brake Control (SBC) (Page 689)".
Differences between "SS1 with OFF3" and "SS1 with external stop"
"SS1 with OFF3" and "SS1 with external stop" have the following differences:
● In order to activate "Safe Stop 1 with external stop",
set p9653 to 1.
● When SS1E is selected, the drive is
braked along the OFF3 ramp, but after the delay
time has expired (p9652), only STO/SBC is automatically initiated.
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