Forced Dormant Error Detection - Siemens SINAMICS V90 Operating Instructions Manual

Terminal
STO1
High level
Low level
Selecting/deselecting "Safe Torque Off"
The following is executed when "Safe Torque Off" is selected:
● Each monitoring channel triggers safe pulse suppression via its switch-off signal path.
● A motor holding brake is closed (if connected and configured).
Note
If "Safe Torque Off" is selected and de-selected through one channel within 2 seconds, the
pulses are suppressed without a message being output.
Restart after the "Safe Torque Off" function has been selected
1. Deselect the function in each monitoring channel via the input terminals.
2. Issue drive enable signals.
3. Switch the drive back on.
– 1/0 edge at input signal "ON/OFF1"
– 0/1 edge at input signal "ON/OFF1" (switch on drive)
4. Operate the drives again.
Response time for the "Safe Torque Off" function
The worst response time for the STO function is 5 ms.
8.4.2

Forced dormant error detection

Forced dormant error detection or test of the switch-off signal paths for Safety Integrated Basic
Functions
The forced dormant error detection function at the switch-off signal paths is used to detect
software/hardware faults at both monitoring channels in time and is automated by means of
activation/deactivation of the "Safe Torque Off" function.
To fulfill the requirements of ISO 13849-1:2006 regarding timely error detection, the two
switch-off signal paths must be tested at least once within a defined time to ensure that they
are functioning properly. This functionality must be implemented by means of forced dormant
error detection function, triggered either in manual mode or by the automated process.
SINAMICS V90, SIMOTICS S-1FL6
Operating Instructions, 09/2015, A5E36037884
State
STO2
Low level Unsafe
High level Unsafe
8.4 Safety Integrated basic functions
Fault F1611 occurs and servo motor coasts down (OFF2).
Fault F1611 occurs and servo motor coasts down (OFF2).
Safety Integrated function
Action
245