No doubt: ist works, but I have a question in mind. As far as I understand, the latching relays are switched back and forth by short pulses from the I/O-controller. But: how does the controller know the initial stage of the relay in order to switch to the desired position? How does the controller know the position of the relay after power failure with complete controller-reset?

Please help a curious man!

73
Karsten
DK4AS
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