Siemens SINUMERIK MC Commissioning Manual page 119

Figure 4-6
With external stop, "Safe Stop 2" functions in principle exactly the same way as described in the
previous sections. Note, however, the following differences:
Differences between "Safe Stop 2 with OFF3" and "SS2 with external stop (SS2E)"
● When SS2 is selected with external stop, the drive does not automatically brake the motor,
but instead, follows the specified speed setpoint.
● During delay time p9553, the brake ramp (SBR) and the acceleration (SAM) are not
monitored and there is no standstill detection.
● SOS becomes active after the delay time p9553 expires.
P9553 must be set in such a way that the axes are braked to a standstill with the set
dynamics.
● In order to activate "Safe Stop 2 with external stop", set p9501.18 = 1.
● The PROFIsafe control word S_STW2.28 selects the SS2E function. PROFIsafe
S_STW2.28 is contained in telegrams 31, 901, 902 and 903.
● The PROFIsafe status word S_ZSW2.28 indicates whether the SS2E function is active. The
PROFIsafe status word S_ZSW2.28 is contained in telegrams 31, 901, 902 and 903. The
associated diagnostics parameter is r9722.28.
In the "Safety Info Channel", status word S_ZSW3B.11 indicates whether function SS2E is
active. The associated diagnostics parameter is r10234.11.
Diagnostic parameters p9722.28 and p10234.11 are also set during an internal STOP D.
Deselecting function SS2E while SS2E is active
Figure 4-7
Safety Integrated (with SINAMICS S120)
Commissioning Manual, 02/2020, A5E46305916B AB
Selecting function SS2E
Deselecting function SS2E while SS2E is active
Safety functions integrated in the drive
4.6 SS2
119