Response Times - Siemens SIMATIC ET 200SP Manual

Response times

Introduction
The next section shows the response times of the digital input module F-DI 8×24VDC HF.
The response time of the digital input module F-DI 8×24VDC HF is included in the
calculation of the F-system response time.
Definition of response time for fail-safe digital inputs
The response time represents the interval between a signal change at the digital input and
reliable availability of the safety frame on the backplane bus.
Times required for the calculation
Maximum internal processing time: T
Maximum cycle time: T
Short circuit test time for the sensor supply configured for the channel = "Time for short
circuit test" + "Startup time after short circuit test"
The input delay, short circuit test times, and discrepancy time are configured in STEP 7.
If you have configured "Supply value 0", the sensor-actuator response time is not affected by
the discrepancy time.
Maximum response time in the error-free case with 1oo1 evaluation
Maximum response time = T
configured for the channel
Maximum response time in the error-free case with 1oo2 evaluation
Maximum response time = T
sensor supply configured for channel n, short circuit test time for the sensor supply
configured for channel n+4)
Maximum response time with external short circuits
Maximum response time = input delay + (n × T
"Startup time after short circuit test" for sensor with activated short circuit test)
n = Number of sensor supplies with activated short circuit test
Digital input module F-DI 8x24VDC HF (6ES7136-6BA00-0CA0)
Manual, 07/2013, A5E03858068-01
= 20 ms
max.
= 11.5 ms
cycle
+ Input delay + Short circuit test time for the sensor supply
max
+ Input delay + Maximum (short circuit test time for the
max
) + sum ("Time for short circuit test" +
cycle
A
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