Siemens SINAMICS S120 Installation And Start-Up Manual page 175

Behavior with emergency stop
An emergency stop is triggered by the S3 button ("Emergency stop"). This causes
the drives in stop category 1 (to EN 60204-1) to stop.
S Signal 0 is specified at terminal X122.2 (DI 1: 2nd OFF3) of the drive by means
of the instantaneous enable contacts for safety combination A1. The drives are
immediately braked via the speed ramp (p1135) and the pulses canceled.
S The safe delayed enable contacts for safety combination A1 open once the set
delay time has elapsed. This activates the "Safe standstill" function of the drives
via two channels via terminal X122.3 (DI 2) on the Control Unit and terminals
X21.3 (EP +24 V) and X21.4 (EP M) on the Motor Module. When all the
grouped drives have activated "Safe standstill", this is confirmed via terminal
X122.10 (DO 10: SH group active).
S The confirmation from the safety combination and the drive is monitored in the
PLC to ensure that it is plausible.
Behavior when the protective door is opened
To issue a request to open the protective door, press the S2 button ("OFF"). This
causes the drive in stop category 1 (to EN 60204-1) to stop.
S Signal 0 is specified at terminal X122.2 (DI 1: 2nd OFF3) of the drives when
PLC output DO3 is reset. The drives are immediately braked via the speed
ramp (p1135) and the pulses canceled.
S When the drives have reached a standstill (DO 8 and DO 9: |n|<p2161), the
"Safe standstill" function for the drive is activated via two channels when the
PLC output DO 2 is reset. The status is returned to the PLC (DI 8) via terminal
X122.10 (DO 10: SH active).
S When the PLC detects that the "Safe standstill" function has been selected
(PLC DI 8 "SH active"), the interlock for the protective door is released when
coil Y1 is energized (PLC output DO 4) and the protective door safety circuit is
interrupted via switch S6. Safety combination A2 opens its safety circuits.
Note
If the PLC malfunctions and causes the interlock for the protective door to open
before the drives reach speed = 0, signal 0 is specified at terminal X122.2 (DI 1:
2. OFF3) of the Control Unit via the BICO interconnection with the drives via the
instantaneous enable contacts of safety combination A2. The drives are braked
immediately via the speed ramp (p1135) and the pulses canceled. At the same
time, the switching status of the safety combination is reported to the controller.
You must ensure that potentially dangerous movement is brought to a halt
beforehand.
E Siemens AG, 2004. All rights reserved
SINAMICS S120 Installation and Start-Up Manual, 12/04 Edition
SINAMICS Safety Integrated (Booksize)
Application examples
5-175