Siemens simatic s7-3003/14/2024 ![]() Upon masterreset (MRES), the RAM (work memory) of the CPU is cleared along with the I/O image tables, the CPU parameters are reset, and the complete program is reloaded from the load memory (in your case, the MMC). The diagnostic buffer, the MPI parameters, the time, and the runtime meters are not reset.So, to answer your question directly: If a memory card (Flash EPROM) is plugged in, the CPU copies the user program from the memory card to the work memory (including the CPU and module parameters if the appropriate configuration data are also on the memory card).The MPI parameters set prior to the memory reset are retained. The system parameters and the CPU and module parameters are reset to the default settings.The entire user program in the work memory and in the RAM load memory and all address areas are cleared.Resetting the CPU memory returns the CPU to its initial status, as follows: The memory can be reset manually using the key switch (MRES) or from the programming device (for example, before downloading a user program). power supply 24 V DC, work memory 128 KB, Front connector (2x 40-pole) and Micro Memory Card required. ![]() ![]() The CPU memory can be reset in STOP mode. SIMATIC S7-300, CPU 313C, Compact CPU with MPI, 24 DI/16 DO, 4 AI, 2 AO, 1 Pt100, 3 high-speed counters (30 kHz), Integr. Here is a more complete presentation of the MRES function, taken from this manual (see section 27.1.2): Sorry, the description given in the linkabove is a little sketchy. ![]()
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