Instruction manual

ControlWave Micro Instruction Manual (CI-ControlWave Micro)
Figure 1-3. CPU Module with Two Serial and Two Ethernet Ports
CPU Backup Battery
CPU modules have a coin cell socket on the battery backup board that
accepts a 3.0V, 300 mA-hr lithium battery. This 3.0V battery provides
backup power for the real-time clock and the system’s Static RAM
(SRAM).
CPU Memory
There are several different types of memory used on the CPU module:
Boot/Downloader FLASH
Boot/download code is contained in a single 512 Kbyte FLASH chip.
Boot FLASH also holds the value of soft switches, audit/archive file
configurations, and user account and port information.
FLASH Memory
The CPU module contains 16 MB of FLASH memory. The FLASH
memory holds the system firmware and the boot project. Optionally
FLASH memory also stores the zipped ControlWave project (*.zwt),
user files, and historical data (audit/archive files).The FLASH does not
support hardware write protection.
System Memory (SRAM)
The CPU module has 2 MB of static random access memory (SRAM).
During power loss periods, SRAM enters data retention mode (powered
by a backup 3.0V lithium battery). Critical system information that must
1-6 Introduction Revised May-2011