Owner`s manual

CPU Module
4-4
Table 4-1 ACE3600 CPU Memory
Model
3610
Model
3640
Flash memory
16 Mb 16 Mb
SDRAM
memory:
32 Mb 32 Mb
User FLASH:
3 Mb 3 Mb
User SDRAM:
10 Mb 10 Mb
SRAM Plug-In
4 Mb 4 Mb
Real Time Clock (RTC)
The CPU includes a low drift RTC. The date and time are retained using an on-board
rechargeable lithium battery.
The CPU date and time can be set using the ACE3600 STS. The CPU can also be
synchronized with other RTUs in the system, using the system clock. For more information,
see the Setting/Getting a Site’s Date and Time section or the Creating a User Application
section of the ACE3600 STS User Guide.
Backup Battery for SRAM and RTC
The CPU module includes a rechargeable lithium battery that provides backup power and data
retention for the SRAM and RTC.
The lithium battery is located on the CPU board and cannot be replaced.
The lithium battery is capable of preserving the data stored in the SRAM and RTC for 90 days
(accumulated time of power off.)
CPU Firmware and Operation Modes
The CPU firmware is a real-time multitasking operating system, based on the Wind River
VxWorks OS. The CPU shipped from the factory with the most recent firmware version, and it
can be updated/replaced using a remote or local connection. Downloading firmware updates is
performed using the STS. (See Downloading to a Site in the ACE3600 STS manual.) If the
new firmware download stops or fails, the CPU will restart with the existing firmware.