Emerson Process Management Bristol ControlWave ExpressPAC - Manual (Page 11)

ControlWave ExpressPAC Instruction Manual (CI-ControlWave EPAC)
Revised Mar-2011 Introduction 1-5
 512KB boot/downloader FLASH,
 8MB simultaneous read/write FLASH memory
Board Variations The CPU/System Controller board has three basic variations:
Table 1-1. CPU/System Controller board Variations
CPU Nominal
Input
Power
Ethernet
Port?
Solar
Regulator
?
Auxiliary
Power
Output?
RTD Input?
14MHz
ultra low
power
+6Vdc or
+12Vdc No Yes Yes Yes. Connects to
100-ohm
platinum bulb.
Uses DIN 43760
curve.
33MHz
low
power
+12V or
+24Vdc No Yes Yes No
33MHz +12V or
+24Vdc
Yes No No Yes (same as
ultra low power)
Note: Each of the variants shown in Table 1-1 may be ordered with or
without special gas calculation firmware.
CPU Backup Battery The CPU/System Controller board has a coin cell socket 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 by the CPU:
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 ControlWave ExpressPAC includes 8 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 ControlWave ExpressPAC has 2 MB of static random access
memory (SRAM). During power loss periods, SRAM enters data