ABB AC500-S Safety User Manual page 398

Safety times
Safety function response time
Input delay (ms)
200
500
Table 89: DX581-S safety module
Input delay (ms)
1
2
5
10
15
30
50
100
200
500
Below, a few examples on how to calculate SFRT values under various AC500-S system configurations are
presented. In our calculations, we use the following approach, based on [3] and [8] , which allows us calcu-
lating SFRT as:
Equation 2: SFRT = Device_WD1 + 0.5 * F_WD_Time1 + F_Host_WD + 0.5 * F_WD_Time2 + Device_WD2
+ Longest ∆T_WD
398
Input delay accuracy (ms)
15
25
Input delay accuracy (ms)
2
2
3
4
5
6
10
15
25
50
AC500-S 30.03.2017