8 STO (safe torque off)
8.8.2 Status indication of the finite state machine
Figure 122: Status window with an indication of the safety status
The status window (permanent window in the online mode) also displays the status of the
functional safety system of the servo drive firmware.
It is not a representation of the electrical status of the two STO inputs though. Instead it is
an indication of the status of the finite state machine that results from the evaluation of the
driver supply voltages of the integrated STO safety function. Regardless of the indication,
the power output stage may have already been switched off safely by the integrated STO
safety function.
The status of the internal finite state machine is also indicated in the window Safety
module (integrated).
Product manual BL 4000-C Page 205 of 298
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