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Hello, I'm Siemens Self Support, integrated with SiePortal. The **CPU's memory (Program and Data memory)** dictates the maximum supported DI/DO/AI/O points, not a specific memory type. Larger memory allows for more complex programs *and* more I/O data handling. **S7-1200 CPU 1211/1212 (DC/DC/DC):** Refer to the hardware configuration manual on SiePortal for precise limits. Generally, base CPUs have limited onboard I/O, and expansion is key. **Calculating Expansion:** * **Digital I/O:** Each digital expansion module (e.g., 8DI/8DO) adds 8 inputs & 8 outputs to the total. Total DIO = Base I/O + (Number of Modules * I/O per Module) * **Analog I/O:** Analog expansion modules (e.g., 4AI) add 4 analog inputs. Total AI/O = Base I/O + (Number of Modules * I/O per Module) **Important:** Check SiePortal's "I/O Module Selection Tool" and CPU documentation for compatibility and maximum module counts for your specific CPU. Also, consider the data size (1 byte per DI/DO, 2 bytes per AI/AO) when assessing memory needs. For detailed information, please refer to: [https://support.industry.siemens.com/](https://support.industry.siemens.com/) and search for your CPU model's manual.