Campbell Scientific CR1000KD CR1000 Measurement and Control System - Page 331
Table 76., CR1000 SRAM Memory
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Section 8. Operation Internal Serial Flash3 12 kB: Device Settings 500 kB: CPU: drive External Flash (Optional) 2 GB: USB: drive Device Settings - A backup of settings such as PakBus address, station name, beacon intervals, neighbor lists, etc. Rebuilt when a setting changes. CPU: drive - Holds program files, field calibration files, and other files not frequently overwritten. Slower than SRAM. When a program is compiled and run, it is copied here automatically for loading on subsequent power-ups. Files accumulate until deleted with File Control or the FilesManage() instruction. Use USR: drive to store other file types. Available CPU: memory is reported in Status table field CPUDriveFree. USB: drive - Holds program files. Holds a copy of requested final-storage table data as files when TableFile() instruction is used. USB: data can be retrieved from the storage device with Windows Explorer. USB: drive can facilitate the use of Powerup.ini. External CompactFlash (Optional) ≤ 16 GB: CRD: drive CRD: drive - Holds program files. Holds a copy of final-storage table data as files when TableFile() instruction with Option 64 is used (replaces CardOut()). See Writing High-Frequency Data to CF Cards (p. 266) for more information. When data are requested by a PC, data first are provided from SRAM. If the requested records have been overwritten in SRAM, data are sent from CRD:. Alternatively, CRD: data can be retrieved in a binary format using datalogger support software (p. 77) File Control. Binary files are converted using CardConvert software. 10% or 80 kB of CF memory (whichever is smaller) is reserved for program storage. CF cards can facilitate the use of Powerup.ini. 1SRAM ·CR1000 changed from 2- to 4-MB SRAM in Sept 2007. SNs ≥ 11832 are 4 MB. 2Flash is rated for > 1 million overwrites. 3Serial flash is rated for 100,000 overwrites (50,000 overwrites on 128-kB units). Care should be taken in programs that overwrite memory to use the CRD: or USR: drives so as not to wear-out the CPU: drive. ·The CR1000 changed from 128- to 512-kB serial flash in May 2007. SNs ≥ 9452 are 512 kB. Table 76. CR1000 SRAM Memory Use Comments Static Memory Operational memory used by the operating system regardless of the user program. This sector is rebuilt at power-up, program re-compile, and watchdog events. Operating Settings and Properties "Keep" memory. Stores settings such as PakBus address, station name, beacon intervals, neighbor lists, etc. Also stores dynamic properties such as the routing table, communications timeouts, etc. CRBasic Program Operating Memory Stores the currently compiled and running user program. This sector is rebuilt on power-up, recompile, and watchdog events. 331