Siemens SINAMICS S120 Function Manual page 96

Application examples
7.1 Safe Stop 1 (SS1, time-controlled) when protective door is locked, emergency stop switch-off
Behavior when the protective door is opened
To issue a request to open the protective door, press the S2 button ("OFF"). The drive is
brought to a standstill in accordance with stop category 1 of EN 60204-1.
● Resetting the PLC output DO 2 will trigger an SS1 at terminal X122.2 on the CU (DI 1)
● When all drives have executed the safe pulse cancelation, the feedback "STO in group
● When the protective doors are opened, the protective door safety circuit is interrupted
Note
The position of the protective door interlock is monitored by S6! If a fault on the PLC
causes the lock of the protective door to open, an SS1 is initiated via S6 at terminal
X122.2 (DI 1) of the Control Unit and at the EP terminals of the Motor Modules. The
drives are immediately braked via the speed ramp (p1135), and the pulses canceled after
the SS1 delay time has elapsed. When the protective door is opened, the "Safe Stop 1"
function is safely selected.
Switching on the drives
The drives can be started when the protective door is shut and emergency STOP pushbutton
S3 is released. The emergency STOP pushbutton S3 must be unlocked before pushbutton
S1 ("ON") is actuated. With the safety combination, the ON circuit Y33, Y34 is checked for a
short-circuit when terminals Y43 , Y44 are open (i.e. if Y33 and Y34 are closed before
emergency stop pushbutton S3 is closed, this is identified as a fault). The Line Module must
be switched on via PLC output DO 5 on the PLC by means of an edge from "0" to "1".
● Once you have pressed button S1 ("ON"), safety combination A1 switches to "ready for
● By setting the PLC output DO 2, the SS1 and STO safety function is de-selected on two
● Due to a rising edge at PLC output DO1, the drives can be switched back to "operation"
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and at the EP terminals of the Motor Modules. The drives are immediately braked via the
speed ramp (p1135). The speed ramp is not monitored for SS1. The pulses are safely
canceled after the safe SS1 delay time (p9852, p9652) has elapsed.
active" (DO 10) is issued from the CU to the PLC. In addition, a request is made via the
PLC (PLC: DI 7 and DI 8) if the drives have fallen below the preset speed threshold (D0 8
and DO 9: |n|<p2161).
Only when these conditions are met, solenoid Y1 (PLC output DO 4) is energized and the
lock of the protective door opened.
and safety combination A2 opens its safety circuits.
operation". When PLC output DO 4 is reset, the coil of tumbler Y1 is no longer energized
and the protective door is locked. Safety combination A2 is also ready for operation.
channels via terminal DI 1 X122.2 on the Control Unit and terminals X21.3 (EP +24 V)
and X21.4 (EP M) on the Motor Modules.
mode via terminal X122.1 (DI 0: OFF1).
Function Manual, (FHS) , 07/2007 Edition, 6SL3097-2AR00-0BP0
Safety Integrated