[Solved] Comparing Siemens S7 Controllers: S7-200, S7-300, S7-400, S7-1200, S7-1500 - Selection Criteria?

The discussion focuses on the differences between various Siemens S7 controllers: S7-200, S7-300, S7-400, S7-1200, and S7-1500. Key selection criteria include communication protocols (e.g., Profibus, Profinet), maximum I/O capacity, programming environments (Microwin, Step7, TIA Portal), operational speed, and memory capacity. Users emphasize the lack of a universal guide for selecting the appropriate controller due to the diverse applications and requirements. The S7-1200 is noted for its compact design, suitable for smaller applications, while the modular S7-300 and S7-400 are better for larger systems. Additionally, inquiries about specific documentation for WinCC and characteristics of PAC and DCS systems are raised, along with considerations for failsafe outputs.
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