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10
Response Times
Introduction
The response times of ET 200eco fail-safe I/O module are listed below. The
response times of the fail-safe I/O module are included in the calculation of
F-system response time.
You will find information about the calculation of F-system response times in the
Safety Engineering in SIMATIC S7 system description.
Definition if Response Time for Fail-Safe Digital Inputs
the response time is the time between a signal change at the digital input and
reliable generation of the safety message frame on PROFIBUS DP.
Maximum Response Time of the ET 200eco 4/8 F-DI
Formula for calculating the maximum response time if there is no fault:
Maximum response time without fault =
*
Short-circuit test time = 2 x input delay
You set the input delay and the short circuit test in STEP 7 (see Section 8.2).
Table 10-1
Evaluation of sensors
Maximum Response Time if a Fault Occurs:
The following table shows the maximum response times of the fail-safe ET 200eco
I/O module when an error/fault is present, depending on the parameter assignment
in STEP 7 and the evaluation of the sensors.
Table 10-2
Input delay
Short-circuit test deactivated
Short-circuit test activated
**
in 1oo2 evaluation, the response times also depend on the set discrepancy times:
Provide value 0: The times in the formula/table above apply.
Provide last valid value: The times in the formula/table above are extended by the set discrepancy
time.
ET 200eco Distributed I/O Station Fail-Safe I/O Module
A5E00297494-02
ET 200eco 4/8 F-DI: Internal Conditioning Times
1oo1 and 1oo2
ET 200eco 4/8 F-DI: Maximum Response Time if a Fault Occurs
T
+ input delay + short-circuit test
max
time*
Minimum Internal
Conditioning Time T
13 ms
1oo1 Evaluation
3 ms
15 ms
35 ms
47 ms
55 ms
106 ms
Maximum Internal
Conditioning Time T
min
20 ms
1oo2 evaluation
3 ms
15 ms
23 ms
35 ms
29 ms
65 ms
max
**
10-1
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