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Commercial PLCs' Schematic

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Sobakava

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I need schematics of commercial PLCs' such as Siemens, OMRON.
Actually I am only interested in know about analog/digital input
and output stages and power supplies.

I need to feed my 5V circuit from 24V and I am looking for
a cost effective power supply schematic. The switching regulators
that I found (>500mA) cost at least 3$
 

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