T100MD888+ PLC only has small amount of onboard memory - 4000 words of RAM and 1700 16-bit words of EEPROM for data storage. With M2018P you could expand EEPROM to 7750 word for data storage and that's all.
If you connect the T100MD888+ to a PC running TLServer, then the PLC could open a file on the PC and store data in text or CSV format. In this case, there is no limit to how much data you can store and the stored data are immediately available to the PC for importing into words of MS-Excel spreadsheet or database.
