Response Times
D.1 Response Times
ET 200pro Distributed I/O System - Fail-Safe Modules
156 Operating Instructions, 05/2007, A5E00394073-02
Table D-2 8/16 F-DI DC24V PROFIsafe Electronic Module, Inputs of the 4/8 F-DI/4 F-DO
DC24V/2A PROFIsafe, and F-Switch PROFIsafe: Internal Preprocessing Times
Electronic module Evaluation of the
sensors
Minimum internal
preprocessing time T
min
Maximum internal
preprocessing time T
max
8/16 F-DI 1oo1 and 1oo2 3 ms 12 ms
4/8 F-DI/4 F-DO 1oo1 and 1oo2 4 ms 7 ms
F-Switch
PROFIsafe
1oo2 4 ms 8 ms
Maximum response time if a fault occurs:
The following table shows the maximum response time of the F-DI module when a fault
occurs, depending on the parameter assignment in
STEP 7
and the evaluation of the
sensors.
Table D-3 Electronic Modules: Maximum Response Time if a Fault Occurs
1oo1 evaluation 1oo2 evaluation** Electronic module Input delay
0.5 ms 3 ms 15 ms 0.5 ms 3 ms 15 ms
Short-circuit test
disabled
15 ms 15 ms 15 ms 10 ms 10 ms 10 ms 8/16 F-DI
Short-circuit test
enabled
37 ms 58 ms 161 ms 10 ms 15 ms 41 ms
Short-circuit test
disabled
19 ms 19 ms 19 ms 10 ms 10 ms 10 ms 4/8 F-DI/4 F-DO
Short-circuit test
enabled
30 ms 40 ms 90 ms 10 ms 18 ms 42 ms
Short-circuit test
disabled
- - 10 ms - F-Switch
PROFIsafe
Short-circuit test
enabled
- - 23 ms -
**: With 1oo2 evaluation, the response times also depend on the assigned behavior at discrepancy:
Provide value 0: The times in the above table apply.
Provide last valid value: The times in the above table are extended by the amount of the assigned
discrepancy time.
Note
Please note that the Excel file for calculation of the maximum response times provided with
the
S7 Distributed Safety
optional package already supports calculation of the extension of
the "Maximum response time if a fault occurs" by the assigned discrepancy time.
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