The FRAMRTC-0/256 provides the following to the Nano-10 or FMD PLC:
1) 11,000 16-bit words of Ferromagnetic RAM (FRAM) memory that will be used as primary storage for the user’s EEPROM data. These FRAM memory can also be used to store up to 549 strings of 40 characters per string. These FRAM memories allow an unlimited number of read and write cycles at full speed and they are thus much better than the traditional “EEPROM” memory.
2) A lithium battery-backed Real Time Clock (RTC). Athough there is an internal RTC on Nano-10 PLC, it loses its content when the PLC is powered OFF and you will need to set the RTC when the PLC is powered ON again. On the FRAMRTC the clock is maintained by the 3V lithium cell battery and will run continously even when power OFF. Nano-10 CPU automatically detects the presence of FRAM-RTC-0/256 and will load its internal RTC with the data from FRAMRTC upon power ON.
3) FRAM-RTC-256 adds 256K bytes of extended data file space to the Nano-10 or FMD PLC (in addition to the 60K bytes on board). These may be used to serve more webpages or used by the PLC to log data as data file and the data file may be uploaded via FTP to external FTP server. For more details please download Extended File System manual.
4) With FRAM-RTC-256, the FMD PLC will be able to use the I2C_WRITE and I2C_READ comand and it will also be able to control the DAC #3 and DAC #4.