396353-01-0 模拟输出模块

396358-01-2

The CPU (central processing unit) module houses the multi-layer PCB, which contains the ControlWave CPU, I/O monitor/control, memory, and communication functions. It also may include the optional
Secondary Communications Board (SCB).
The CPU module includes:
 AMD Elan SC520 microprocessor running at 100 MHz
 two RS-232 communication ports
 one 10/100baseT Ethernet port
 2 MB of battery backed Static RAM (SRAM)
 64 MB of Synchronous Dynamic RAM (SDRAM)
 512 KB boot/downloader FLASH
 32 MB simultaneous read/write FLASH memory
 transmit (TX) and receive (RX) LEDs for each communication port
 Keyed run/remote/local operation switch
 configuration DIP switches (described in Chapter 2)
 Port 80 display to show status codes
You can order the CPU module with the optional secondary communication board (SCB) for additional communication ports. See CPU Module Configurations.

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 32 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 the CPU backup battery). Critical system information that must be retained during power outages or when the system has been disabled for maintenance is stored here. This includes the last states of all I/O points, audit/archive historical data (if not stored in FLASH), the values of any variables marked RETAIN, the values of any variables assigned to the static memory area, and any pending alarm messages not yet reported.
SDRAM
The CPU module contains 64MB of synchronous dynamic random access memory (SDRAM). SDRAM holds the running application (ControlWave project) as well as a copy of system firmware and the current values of any variables not marked RETAIN or stored in the static memory area. This allows the system to run faster than it will from the SRAM memory. SDRAM is not battery-backed.
CMOS RAM
The Elan microprocessor includes 124 bytes of complementary metal oxide semiconductor (CMOS) RAM to hold various internal parameters.