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My 808d has S7-200 PLC compatiple

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Siemens S7-200 PLC Programming

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Intro to PLCs. Siemens S7-200
Siemens S7-200 – Getting Started
NOTE: Input circuits are one one side with perhaps high voltages. We want to shield these from the PLC chip using an opto-coupler which creates a gap by simple letting the high volt input circuit turn on an LED and shine onto an photosensitive transitor which pulls the PLC bit high