Small explanation of Omron 2 modules.
https://eu.mouser.com/datasheet/2/307/OMRNS03955_1-2560072.pdf
They are out of production but available on ebay hundreds of them.
What they are doing:
With 2 wires you connect 2 of them they share signals Input and Output. Distance 100 m - 500 m as well.
No need of many wires cable channels ect ect... 2 wires between them. if power is on 1 side long distance is max. 100m.
Example: On INPUTS A0-A7 you connect signals from level sensors using common - minus or in some sensors
as well + power. A0= level sensor water Min. A1= level sensor water Max. ect ect
as sensors have different position some in main aquarium, some on sump ect. cable distance is not allways
enough and i personaly hate to prolong them. Here we connect all of them and with 2 wires signal goes to
anoter same modul near power control unit that give signals from second module from B0-B7 to relays or even
directly to equipment depend of what we want to logicaly control or connect together with certain signal from unit 1
that giving signals. Output part can go bidirectional giving back to A signal from B for example when flow pump is not giving signal
to activate another pump in reserve...As this unit work on very low voltage as well its reliable when power is OFF some PNP signal
will be ON for main circulating pump relay to avoid long hours that water is still. Simple connection to avoid
any fail of any Logo, equipment or power pump will still working on battery backup + Im add also solar inverter
seaprate power backup with one good solar panel no more and solar small controller to avoid any longer disruption
of power failure. Dont relly on 1 power and loose all your fish and have jungle swamp in few hours.
