Owner`s manual

CPU Module
4-3
Buzzer
The CPU module includes a buzzer (audio indication), which is used to indicate task
completion (such as end of download/upload, restart etc.) and can also be controlled from the
user application program.
Pushbuttons
The CPU includes two pushbuttons on the front panel, PB1 and PB2.
These pushbuttons are used for activating and testing the modules LED, restarting the unit,
erasing the user Flash memory and activating memory test. Table 4-2 describes the
pushbuttons functionality.
The pushbuttons can also be monitored by the user application program (when it is running) for
the application purposes.
LEDs
The CPU includes CPU status LEDs, port status LEDs, and user LEDs. Some of the LEDs are
single color (green) and some are bicolor LEDs (red, green or orange).
Status LEDS indicate the CPU status in startup (boot), run-time or when there is a failure. The
communication LEDs are used to indicate the communication port status. The user LEDs can
be used by the user application program. Note that during startup or failure, the communication
and user LEDs are used to indicate various situations. Table 4-3 details the LEDs functionality.
CPU Memory
The ACE3600 CPU includes FLASH, SDRAM, and optional SRAM Plug-in memory.
The FLASH stores the firmware, the user application program, and the user data.
The SDRAM memory stores the temporary data.
The optional SRAM memory expansion is used for logging user data. The SRAM data is
retained using an on-board rechargeable lithium battery. The battery will retain the SRAM
data for a minimum of accumulated 90 days without power. When the SRAM option is not
used, the Lithium battery will keep the Real Time Clock running for two years.
The size of the CPU memory is determined by the model as shown in the table below.