Safety engineering
Safety functions
Safe torque off
1
1.3
1.3.3
1.3-5
EDS94AYAD EN 2.2
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
safely interrupted. The motor c annot 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.
Priority function: none
Subordinated function: SS1
t
n
0
1
t1
t
0
'1'
0
SMxDIASTO
Input signal of the request of a safety function
’1’ Logic signal level ”1” / ”true”
Speed characteristic n of the motor
tx Action instant
tTimeaxis
1.3.3.2 Conditions
Condition for using the function:
ƒ The basic device must be equipped with a communication module
E94AYCPM (PROFIBUS-DP), SW version 0.9 and connected to the
PROFIBUS.
ƒ The basic device must receive PROFIBUS data telegrams from a master
controller.
Danger!
If the request for the safety function is cancelled, the drive will
restart automatically.
You must provide external measures which ensure that the drive
only restarts after a confirmation (EN 60204).
1.3.3.3 Settings
This function does not have any parameters to be set.
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