Siemens SIMATIC ET 200S Installation And Operating Manual page 173

Maximum Response Time of the EM 4/8 F-DI DC24V PROFIsafe
Formula for calculating the maximum response time if there is no fault:
Maximum response time
without a fault = T
*: Short-circuit test time = 2 x input delay
Parameters for the input delay and the short-circuit test are assigned in
Table D-5
Evaluation of the Sensors
1oo1 and 2oo2
Maximum response time if a fault occurs:
The following table shows the maximum response times of the F-DI module when an
error/fault is present, depending on the parameter assignment in
of the sensors.
Table D-6
Input delay
Short-circuit test deactivated
Short-circuit test activated
**: With 1oo2 evaluation the response times also depend on the configured discrepancy response:
Provide 0 value: The times in the above table apply.
Provide last valid value The times in the above table extend to the configured discrepancy time.
Note
Please note that the Excel files for calculation of the maximum response times (
and
packages already supports calculation of the extension of the "Maximum responses time in
the event of a fault" by the configured discrepancy time.
ET 200S Distributed I/O System - Fail-Safe Modules
Hardware Installation and Operating Manual, 07/2005, A5E00103686-04
+ input delay + short-circuit test time*
max
EM 4/8 F-DI DC24V PROFIsafe: Internal preparation times
EM 4/8 F-DI DC24V PROFIsafe: Maximum Response Time if a Fault Occurs:
s7ftimeb.xls
) provided with the
Minimum internal processing
time T
min
5 ms
1oo1 evaluation
0.5 ms 3 ms 15 ms
18 ms 20 ms 32 ms
29 ms 40 ms 91 ms
S7 Distributed Safety
Response Times
STEP 7
).
Maximum internal
processing time T
11 ms
STEP 7
and the evaluation
1oo2 evaluation**
0.5 ms 3 ms
12 ms 14 ms
13 ms 20 ms
s7fcotib.xls
S7 F/FH Systems
and
max
15 ms
26 ms
56 ms
option
D-3