
Fig. 10 Timing diagram SS1
Legend for SS1 timing
Term/abbreviation
Explanation
Timer
Delay element in safety relay unit
CTRL-EN
Enable signal
t
Delay
Delay time until STO is requested (drive has safely come to a standstill)
#STO-A/B
2-channel input for STO request
#SBC-A/B
2-channel input for SBC request
STA
Feedback, STO active
SBA
Feedback, SBC active
t
1
Braking ramp takes place, speed = 0 (functional)
t
2
Brake closed, and output stage switched off (functional)
n
Rotational speed
Tab. 7 Legend for SS1 timing
SBC request
Product overview
18
Festo — CMMT-AS-...-S1 — 2018-02