78 Safety functions
Step Description
1 The STO request is received (for example, from the I/O). The FSO activates the drive
STO function. STO active indication parameter STO output (STO.21) goes on.
2 After time C has elapsed, the acknowledgement becomes allowed as soon as the STO
request has been removed (step 5).
3 The motor speed goes below the SBC speed limit (A) and the FSO activates the SBC
function (brake).
4 The motor speed reaches the zero speed limit (B), the FSO module defines the motor
as stopped and the STO completed indication goes on. The acknowledgement
becomes allowed despite of value C as soon as the STO request has been removed
(step 5).
5 The STO request is removed.
6 After the acknowledgement, the STO and SBC functions are deactivated, and the
control is given back to the drive, which controls the brake from now on. The
indications STO output (STO.21) and STO completed output (STO.22) go off.
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