How do you save a STEP 7 project as read-protected on an MMC in an S7-300 CPU? - ID: 26123821 - Industry Support Siemens
Siemens SIMATIC S7 Micro Memory Card für S7-300/C7/ET 200 (6ES7953-8LG31-0AA0) for sale online | eBay
Siemens - 6ES7314-1AG14-0AB0 - SIMATIC S7-300, CPU 314 Central processing unit with MPI, Integr. power supply 24 V DC, work memory 128 KB, Micro Memory Card required - IDEAL Process and Automation Pty Ltd
Siemens 6ES7953-8LG31-0AA0 S7 Nflash Micro-Memory Card, For Use With SIMATIC S7-300/C7/ET 200 Series CPU, 32 mm H x 24 mm W x 1.4 mm D | State Electric