Rockwell-automation T7835 ICS Regent+Plus Software Validation Package User Manual download pdf (Page 4)

Software Validation Package for

INTERPRET

835)

Industrial Control Services

INTERPRET

Application Compiler/Download Integrity Check

The method for checking the integrity of the Application

Compilers and download process has these steps:

The compiler generates from the application

Source File

an application

Object File

of MC68000 machine

instructions. The separate

Validator

program generates

Check File

derived from the same

Source File

. The

Check File is an assembly code representation of the

source program (as opposed to the machine

coded Object

File).

Having diverse representations of the application program

deriving from the same source ensures that there is little

likelihood of a common

cause corruption that would go

undetected. Independent generation of machine code and

assembly text provides a supplemental check of the

compiler's code generation.

The application

Object File

is downloaded into triplicated

memories in the Regent. This is the actual executable

application code that is run in the Regent controller.

To provide integrity checking of the compile and download

process, the application

Object File

is uploaded from the

Regent and disassembled, creating an

Echo File

The disassembler is a "third

party" product developed by

an agent not connected with Triplex. This gives it the

advantage of having been made in a different environment

than Triplex tools, thus providing a level of diversity in the

check loop.

The

Checker

program then compares the disassembled

Echo File

with the application

Check File

instruction

instruction to see that they match, closing the loop.

The

Checker

program will report any discrepancies

between instructions in the two files. Once the match is

verified, it can be assumed the compile/load process is

error

free.

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Rockwell-automation T7835 ICS Regent+Plus Software Validation Package User Manual Page 4

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