Response times
D.1 Response Times
Fail-safe signal modules
Installation and Operating Manual, 01/2010, A5E00085586-10
323
Maximum response time of SM 326; DI 24 x DC 24V
Formula for calculating the maximum response time without active error:
Maximum response time without active error = T
max
+ 3 ms* + 6 ms**
Input delay*
** Short-circuit test time = 2 x input delay
You configure the short-circuit test in
STEP 7 (see chapter "SM 326; DO 8 x DC 24V/2A PM
(Page 127)").
Table D- 1
SM 326; DI 24 x DC 24V: Internal signal preparation times
Evaluation of the sensors
Minimum internal signal
preparation time T
min
Maximum internal signal
preparation time T
max
1oo1 and 1oo2
6 ms
23 ms
Maximum response time when a fault occurs:
The following table shows the maximum response time of the SM 326; DI 24 x DC 24V when
a fault occurs, depending on the parameter assignment in
STEP 7 and the evaluation of the
sensors.
Table D- 2
SM 326; DI 24 x DC 24V: Maximum response time when a fault occurs
Short-circuit test parameter
1oo1 evaluation
1oo2 evaluation*
Short-circuit test deactivated
31 ms
29 ms
Short-circuit test activated
31 ms
29 ms
* Response times with 1oo2 evaluation also depend on the assigned behavior at discrepancy:
Provide 0 value: The times listed in the table apply.
Provide last valid value: The times listed in the table are extended by the assigned discrepancy time.
Maximum response time of SM 326; DO 8 x DC 24V/2A PM
The maximum response time of the SM 326; DO 8 x DC 24V/2A PM (with or without fault) is
equivalent to the maximum internal processing time T
max
.
Minimum internal signal preparation time T
min
= 4 ms
Maximum internal signal preparation time T
max
= 14 ms
