ABB ACS880-M04 - STO Data; Safety Data; Temperature Profile for Safety Value Calculations; STO Indication Data

The Safe torque off function 153
STO data
 Safety data
The safety data for the Safe torque off function is given below.
Note: The safety data is calculated for redundant use, and does not apply if both STO
channels are not used.
 Temperature profile for safety value calculations
 STO indication data
Frame
size
SIL/
SILCL
SC PL SFF PFH
D
(T
1
= 20 a)
PFD
(T
1
= 2 a)
MTTF
d
DC Cat. HFT CCF Life
time
(%) (1/h) (a) (%) (a)
R1 to
R4
3 3 e 98.8 3.23E-09 2.99E-06 24293
>
90 3 1 80 20
T
Number of on/off cycles per year
71.66 °C 670 cycles
61.66 °C 1340 cycles
10.0 °C 30 cycles
Board temperature
% of time
32 °C 2.0%
60 °C 1.5%
85 °C 2.3%
Safety component Type A, as defined in IEC 61508-2
STO reaction time
(shortest detectable break)
1ms
STO response time Frame sizes R1…R4: 2 ms (typical), 5 ms (maximum)
Fault detection time Channels in different states for longer than 200 ms
Fault reaction time Fault detection time + 10 ms
STO fault indication
(parameter 31.22) delay
<500ms
STO warning indication
(parameter 31.22) delay
<1000ms