Response times
C
C.1 Response times
Introduction
Below you can nd the response times of the analog input module F-AI 8xI 2-/4-wire HART HA.
The response times of the analog input module are included in the calculation of the response
time of the F System.
Denition of response time for fail-safe analog inputs
The response time species the time between a signal change at the analog input and the safe
provision of the safety message frame at the backplane bus.
The response time results from the number of activated channels/channel pairs, the response
time per channel/channel pair, the basic response time and from the congured smoothing.
Times required for the calculation
• Max. acknowledgment time (Device Acknowledgment Time): T
DAT
= 50 ms
• Dependency of the response time per channel/channel pair:
The module works with 2 channel groups (channels 0-3 and channels 4-7). The channels in
a group are converted simultaneously. See also Chapter 4.3
. Channels are processed as channel pairs. If at least one channel of a channel pair is
activated, this channel pair must be taken into account for the response time.
Channel pairs:
– Channel 0 and channel 4
– Channel 1 and channel 5
– Channel 2 and channel 6
– Channel 3 and channel 7
Response time per channel/channel pair
– At 50 Hz: 30 ms
– At 60 Hz: 27 ms
• Basic response time: 25 ms
Typically response time
The typical response time can be calculated according to the following formula:
F-AI 8xI 2-/4-wire HART HA
Equipment Manual, 09/2021, A5E50557845-AA 113
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