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6 Connection of safety devices
6.1 Dual channel systems
The classic way of making a failsafe system is to use two-channel devices. The system offers
various possibilities for connection of such devices. The figures below show solutions for
connection of two channel devices. The first figure gives example of possible connections and
the second shows the common connection of several dual channel safety devices.
Possible solutions for dual channel inputs with detection of external short circuits
A normal connection of several dual channel devices. One dynamic signal combined with
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