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http://www1.jaycar.com.au/images_uploaded/optocoup.pdf
Purpose: An optocoupler (or optical isolator) uses optics to isolate one circuit from another. The diode in the optical isolator is similar to an LED. The light from this LED controls the gate or base of a transistor. A diode has two terminals, an optocouple will have at least 4. A diode is used to control current flow direction; an optocoupler main purpose is to isolate one circuit from another. etc. etc.
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PLC Scan Time means plc requires some operating cycle to Plc input verification,Plc output updates and Execution of program.
caradon plc was taken over by novar plc,they have now been taken over by melrose plc. is this usefull
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plc
Meaning of PLC
there r 16th types of plc ok
Yes, McDonald's is a PLC.
how a plc stores a programme and executes it