Frequency Analysis Blocks; On Delay Block - Siemens SIDOOR AT40 System Manual

Controllers
6.2 Drive functions
6.2.43.7

Frequency analysis blocks

An input signal can be analyzed for specific frequencies and duty factors via the "FRQ"
frequency blocks. Two identical frequency analysis blocks are available, capable of detecting
frequencies of 1 Hz and 0.5 Hz with a duty factor of 20 %.
The detection criteria and the valid tolerances are described in detail in the following figure.
①
Input signal
②
Output signal
③
The output signal changes after 3 detected signal periods after the 4th edge
An input tolerance of (±) 40 ms is assumed.
•
Duty cycle: 20 % (17 to 23 %)
•
1 Hz frequency detection:
•
– T = 1000 ms (±2 %)
– t = 200 ms
on
– t = 800 ms
off
– Pulse/pulse ratio V = 25 %
0.5 Hz frequency detection:
•
– T = 2000 ms (±2 %)
– t = 400 ms
on
– t = 1600 ms
off
– Pulse/pulse ratio V = 25 %
Image 6-8 Frequency-based input signal detection
The outputs Q24 or Q26 become active when the analysis algorithm detects a frequency of
1 Hz with a 20 % duty factor in the input signal. The outputs Q25 or Q27 become active
when the analysis algorithm detects a frequency of 0.5 Hz with a 20 % duty factor in the
input signal.
The maximum response time at the output, i.e. the time after which the system can detect an
error or a deviation in the input signal frequency, corresponds to the period of the frequency
to be detected. Accordingly, a frequency of 1 Hz results in a maximum response time of 1 s
and a frequency of 0.5 Hz results in a maximum response time of 2 s.
6.2.43.8

On delay block

The "OnDELAY" block delays the input signal at the output Q28 by 2 s and at the output Q29
by 5 s.
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AT40, ATD400V, ATD400K, ATD4xxW, ATD400S, ATE250S, ATD400T
System Manual, 06/2016, A2B00096162-AN