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Reference Guide – DOC. 7150B
3-Series Control Systems
•
3
3-Series Architecture
The following sections provide an overview of the architecture of a 3-Series
control system.
Memory and Directory Structure
A 3-Series processor has between 256 MB and 1 GB of built-in SDRAM
(synchronous DRAM) volatile memory. For more information regarding the
memory specifications for each 3-Series control system model, refer to the
Flash memory contains the file system inside the 3-Series control engine. The
3-Series processor also has 128kB of NVRAM (nonvolatile RAM). NVRAM contains
program variables that are retained after the loss of electrical power, while
volatile memory is lost.
Flash Memory
Flash memory for a 3-Series control system contains the following components:
•
Operating system (.puf file)
•
SIMPL and SIMPL Sharp Pro programs
•
SIMPL+® programming modules
The files that reside in flash memory confirm to a flat directory structure. The
following table details the overall file system:
3-Series Control System Directory Structure
TOP LEVEL
SECONDARY LEVEL
DESCRIPTION
\
The root of the file system
HTML
Web pages
Nvram
NVRAM legacy directory
ROMDISK/User/display
Contains files for the onscreen display
RM/RM2
Mounting point for external removal
media
Simpl/AppXX
Control system program files (where
XX is the program number)
Sys
Contains various system configuration
files
User
Provided for user-defined files