ABB AC500-S - Page 398

Input delay (ms) Input delay accuracy (ms)
200 15
500 25
Table 89: DX581-S safety module
Input delay (ms) Input delay accuracy (ms)
1 2
2 2
5 3
10 4
15 5
30 6
50 10
100 15
200 25
500 50
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
Safety times
Safety function response time
30.03.2017AC500-S398