Siemens SIMATIC S7 300 PLC Hardware | PLC for beginners Tutorial 03

Siemens SIMATIC  S7-300 PLC hardware has a Power supply, CPU (with memory card), DI, DO, AI and AO cards.
It has either a separate module for communication or a communication port might be mounted onto the CPU module.
This tutorial will explain all these hardware components one by one.
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