Logic Controller – Modicon M251
The Modicon M251 is a high-performance logic controller designed for distributed and modular architectures. Unlike the M241, which has a large number of built-in hardware I/Os, the M251 is essentially a “communication hub”—it has no embedded I/O points on the base unit.
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Modicon M340
The Modicon M340 is a compact, mid-range Programmable Automation Controller (PAC) that sits at the core of Schneider Electric's industrial automation range. It is essentially the "little brother" to the M580, sharing the same X80 I/O hardware and programming environment, but in a smaller, non-redundant form factor.
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