Response Times - Siemens SIMATIC ET 200SP Manual

9.4

Response times

The response times specified below represent worst case specifications. The response times
relate to the switch-off operation (status change "1" → "0").
The response times for the switch-on operation (status change "0" → "1") can be longer but
are not relevant for the given safety-related examination.
Maximum response time in the input direction
The maximum response time in the input direction results from the calculation of the
response time from the safe AS-i input slave up to the head module (IM) of the ET 200SP:
max.
max.
max. 20 ms Module-internal processing
max.
--------------------------------------------------------------------------------------------------------------------------
max. 32 ms Total response time in input direction (with 0 ms input delay)
Increased response time
If an input delay time > 0 is assigned for a safe input, this input delay time must be added to
the total response time.
In the total response time indicated above, external influencing variables are not included:
• Response time of the sensor
• Additional response time in the safe AS-i input slave (see operating instructions)
• Bus response time between the head module (IM) of the ET 200SP and the controller
• Response time of the controller
• Timeout time (F-monitoring time) of the controller in case of PROFIsafe failure
These influencing variables must be taken into consideration when calculating the system
response time of the total system.
In the above-indicated total response time, it is taken into consideration that a maximum of 4
AS-i bus cycle times elapse between a safe input slave failure and detection of an error.
Fail-safe Module F‑CM AS‑i Safety ST (3RK7136‑6SC00‑0BC1)
Manual, 03/2017, A5E03957059020A/RS-AB/002
5 ms AS-i bus cycle with maximum configuration
5 ms Disturbance in AS-i bus cycle with maximum configuration
2 ms Transfer ET 200SP backplane bus
WARNING
Technical specifications
9.4 Response times
95