Frequency-Based Input Signals - Siemens SIDOOR ATD401W System Manual

Figure 3-13
* Two 1-channel sensors can also be connected as an alternative.
3.4.2.6

Frequency-based input signals

As well as 1oo2 evaluation with antivalent channels, a frequency-based system can also be
used to implement fail-safe inputs according to PLd.
Two frequency analysis blocks are available for this purpose, and can be linked to any input
channel. For more, see also section Free function blocks (Page 76).
ATD4xxW Door Controller for Industrial Applications
System Manual, 01/2017, A5E38080677-AB
Connect the switchgear to two separate non-equivalent change-over contacts, 2-channel
non-equivalent*
SIDOOR functions
3.4 Safety functions
93