Safety engineering
Safety functions
Safe torque off
1
54
EDS94AYAE EN 6.0
1.3.3 Safe torque off
1.3.3.1 Description
Safe Torque Off/STO
This function corresponds to a "Stop 0" according to EN 60204.
When this function is used, the power supply of the motor is immediately (t1) safely
interrupted. The motor cannot create a torque and thus no dangerous movements of the
drive can occur. Additional measures, e.g. mechanical brakes are needed against
movements caused by external force.
t
t
n
0
0
1
2
t1
I
STO
t1
t
0
I
0
SM301DIA_STO
Input signal of the request of a safety function
I ON state
O OFF state
Speed characteristic n of the motor
t Time axis
tx Action instant
Feedback(s)
The restart behaviour can be set (C15300/1). Function sequence and error response have
no adjustable parameters.
Codes
Parameter: Name: Data type: Index:
C15300 Restart behaviour
UNSIGNED_8 9275
d
= 243B
h
Behaviour for restart after functions have been cancelled
Selection list
(Lenze setting bold) Information
0 Acknowledged restart
1 Automatic restart
Subcodes Information
C15300/1 Restart - STO, SS1
C15300/2 Restart - SS2, SOS
þ Read access Write access o Controller inhibit o PLC-STOP o No transfer
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