Reddit reviews IEC 61131-3: Programming Industrial Automation Systems: Concepts and Programming Languages, Requirements for Programming Systems, Decision-Making Aids
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IEEE 61131-3 is the thing to lookup. I purchased this book as my intro and got some inexpensive PLC hardware to learn: https://www.amazon.com/dp/B00DGEGLQE/ref=cm_sw_r_cp_awdb_t1_50TyCbQTFEHB9