Memory cards are used to store data in a non-volatile manner. In the event of a power failure, only data remains on the memory cards. Cards can be purchased for most PLC controllers, such as Siemens, B&R or Mitsubishi. They differ in write speed and memory size. The software dedicated to each automation device allows you to configure it in such a way as to best fulfill its task. Each manufacturer provides their own software for their devices, which requires the purchase of a license.