Hi every body, last two weeks I was working on understanding what are S7-31x MMCs. In the end I collected following information: 64KB-4MB SIEMENS MMC cards are standard 16MB MMCs with special SIEMENS format.

Datasheet at 8MB SIEMENS MMCs are the same but 32MB MMCs. You can make bit copy of these MMCs by using tools at in standard MMC/SD card reader. By using this tools you also copy the special SIEMENS format. But in case you would like to use non SIEMENS 16MB or 32MB MMC, you cant use it in S7 as every MMC has private CID and CSD register where are stored informacion as OEM/APPLICATION ID, PRODUCT NAME. The example of SIEMENS 64KB MMC is at CID is OTP register and first 14 bytes of CSD are programed only by manufacturer.

Siemens Simatic S7 PLC Trainer w/Lessons. Model: M07-S7-200-SS0-0001. Description: Siemens S7-221 PLC Training Equipment w/ Siemens PLC Programming Training Lessons.

S7 checks and compares stored info. From CID and CSD. If you have SIEMENS MMC accidentaly formated in standard MMC/SD card reader/writer (for example as FAT format) you can repair it in this standard MMC/SD reader/writer.

Read original SIEMENS MMC by S7imgrd (the same size as failed card) 2. Write this image to failed MMC by S7imgwr When I was analyzing MMCs I also find out how is the password stored at the MMC. If you have any question, email me at tischer@atlas.cz. Hello, I'm sorry, I have made mistake in description, if you need to make true bit copy of MMC card or you want to repair failed MMC card, you have to use WinHex program (Here is a procedure: a) read the original MMC in 2 steps 1. 64KB image 8MB image b) write the original image into failed MMC 1. Dont you afraid if you receive the following notice 3.!!!!

S7imgrd and S7imgwr don't make true bit copy of MMC!!!! Petr tischer@atlas.cz.

You are right, but you can use MMC from other manufacturer if CID and CSD records in the MMC match the SIEMENS CID, CSD records. 64KB-4MB SIEMENS MMC cards work on the same hardware (16MB MMC), 8MB SIEMENS MMC are 32MB MMC. You can't copy format from 4MB card to 64KB as 4MB and 64KB cards work at the same hardware because have diferent CID records. S7s recognise MMC size from CID, CSD and card format. All these three records must match.

Mhotspot not working driver problem found with wireless adapter. CID and CSD records are OTP (one time programable by manufacturer)In CSD register last 8 bits and CRC are partialy user programable. I have made my oven CID and CSD card reader/writer and have programed simple C++ program as I hadn't been able to find any standard MMC reader with posibility to read and write CSD register. At the moment I look for any china supplier who will be able supply me with the MMC programed as SIEMENS MMC. If I am succesfull, the price of 8MB MMC will be about 40-50 USD. Images + winhex which there is here do not work. I in hopeless position. See With specified above a site (I took an image and filled in it through winhex 14.1 These versions of images were not picked up by the Spanish program.