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The Siemens 6ES7212-1AE40-0XB0 is a SIMATIC S7-1200 CPU 1212C, a compact programmable logic controller with more onboard inputs and outputs than the entry-level 1211C model. It comes with a built-in power supply, digital and analog I/O, and a PROFINET port, so it can run as a standalone controller without needing extra modules. This makes it a good fit for small to mid-size machines that need a bit more I/O capacity than the base model can offer.
The Siemens 6ES7212-1HE40-0XB0 is a SIMATIC S7-1200 CPU 1212C with a DC/DC/Relay configuration, built for machines that need relay outputs instead of standard transistor outputs. It comes with a built-in power supply, onboard digital and analog I/O, and a PROFINET port, so it works as a standalone controller without extra modules. The relay outputs make it a strong fit for applications switching AC loads or driving devices like contactors, solenoids, and indicator lamps directly.
The Siemens 6ES7214-1AG40-0XB0 is a SIMATIC S7-1200 CPU 1214C, a mid-range compact controller with higher onboard I/O and processing performance than the 1211C and 1212C models. It comes with a built-in power supply, digital and analog I/O, and a PROFINET port, so it runs as a standalone controller straight out of the box. This model is a common choice for machine builders who need more I/O density and memory headroom for growing control programs.