MAIN CHARACTERISTICS range of product MODICON M221 accessory / separate part type SD CARD product compatibility LOGIC CONTROLLER range compatibility MODICON M221 memory type FLASH memory capacity 256 MB accessory / separate part category SEPARATE PARTS COMPLEMETARY CHARACTERISTICS product specific application APPLICATION BACKUP MTBF reliability 3000000 H data retention time 10 yr at 25 °C number of read/write cycles 3000000 product weight 0.004 KG