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SIMATIC S7-300 CPU 315-2 DP Central Processing Unit with MPI interface, integrated 24 V DC power supply, 256 KB work memory, and a second PROFIBUS DP interface that supports DP Master/Slave (Device) communication. A Micro Memory Card (MMC) is required. Siemens currently classifies this model as a spare part.

SIMATIC S7-300 CPU 314 Central Processing Unit (CPU) with MPI communication interface, integrated 24 V DC power supply, 128 KB work memory, and Micro Memory Card (MMC) required. This model is classified by Siemens as a spare part and has been phased out for new sales

SIMATIC S7-300 CPU 312 Central Processing Unit (CPU) with MPI communication interface, 24 V DC integrated power supply, 32 KB work memory, and support for a Micro Memory Card (MMC). Siemens now classifies this model as a spare part, with new product sales discontinued.