ABB AC500-S - Page 403

Based on Fig. 126 and Fig. 127, the following exemplary SFRT values can be achieved for some typical
AC500-S configurations using Ä Equation 2, page 396:
Without PROFINET (DI581-S ➔SM560-S ➔ DX581-S)
SFRT = Device_WD1 + 0.5 * F_WD_Time1 + F_Host_WD + 0.5 * F_WD_Time2 + Device_WD2 + Longest
∆T_WD = 14.5 + 10 + 6 + 10 + 8 + 10 = 58.5 ms
where:
n Device_WD1 = 1 ms + 0.5 ms + 2 x 6.5 ms = 14.5 ms (no test pulses were used)
n F_WD_Time1 = 20 ms
n F_Host_WD = 3 x 2 ms (SF_WDOG_TIME_SET time) = 6 ms
n F_WD_Time2 = 20 ms
n Device_WD2 = 8 ms (output current = ~ 5 mA)
n Longest ∆T_WD = Max (0.5 * F_WD_Time1; 0.5 * F_WD_Time2) = 10 ms
Without PROFINET (DX581-S ➔ SM560-S ➔ DX581-S)
SFRT = Device_WD1 + 0.5 * F_WD_Time1 + F_Host_WD + 0.5 * F_WD_Time2 + Device_WD2 + Longest
∆T_WD = 12.5 + 10 + 6 + 10 + 8 + 10 = 56.5 ms
where:
n Device_WD1 = 1 ms + 0.5 ms + 2 x 5.5 ms = 12.5 ms (no test pulses were used)
n F_WD_Time1 = 20 ms
n F_Host_WD = 3 x 2 ms (SF_WDOG_TIME_SET time) = 6 ms
n F_WD_Time2 = 20 ms
n Device_WD2 = 8 ms (output current = ~ 5 mA)
n Longest ∆T_WD = Max (0.5 * F_WD_Time1; 0.5 * F_WD_Time2) = 10 ms
Without PROFINET (AI581-S ➔ SM560-S ➔ DX581-S)
SFRT = Device_WD1 + 0.5 * F_WD_Time1 + F_Host_WD + 0.5 * F_WD_Time2 + Device_WD2 + Longest
∆T_WD = 76.5 + 10 + 6 + 10 + 8 +10 = 120.5 ms
where:
n Device_WD1 = 2 x 4.5 ms + 67.5 ms = 76.5 ms
n F_WD_Time1 = 20 ms
n F_Host_WD = 3 x 2 ms (SF_WDOG_TIME_SET time) = 6 ms
n F_WD_Time2 = 20 ms
n Device_WD2 = 8 ms (output current = ~ 5 mA)
n Longest ∆T_WD = Max (0.5 * F_WD_Time1; 0.5 * F_WD_Time2) = 10 ms
With PROFINET (DI581-S ➔ SM560-S ➔ DX581-S)
SFRT = Device_WD1 + 0.5 * F_WD_Time1 + F_Host_WD + 0.5 * F_WD_Time2 + Device_WD2 + Longest
∆T_WD = 14.5 + 15 + 6 + 15 + 8 + 15 = 73.5 ms
where:
n Device_WD1 = 1 ms + 0.5 ms + 2 x 6.5 ms = 14.5 ms (no test pulses were used)
n F_WD_Time1 = 30 ms
n F_Host_WD = 3 x 2 ms (SF_WDOG_TIME_SET time) = 6 ms
Safety times
Safety function response time
30.03.2017 AC500-S 403