Allen-Bradley GuardPLC 1753, Safety Reference Manual

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Publication 1753-RM002C-EN-P - September 2008 79
GuardPLC Controller Operating System Chapter 7
Create a Backup Program
Follow these steps when creating a backup program.
1. Print out the application program to compare the logic to the
specifications.
2. Compile the application program to generate the Configuration
CRC of the CPU.
3. Note the version of the Configuration CRC of the CPU by
verifying the set of CRCs.
a. Select a controller in the RSLogix Guard PLUS! software
Hardware Management Window.
b. Use the About Configuration context menu to display
versions.
The important versions to verify include:
•
rootcpu.config (Configuration CRC of the CPU). This indicates
the overall configuration portion of the CPU that is
safety-related.
•
rootcom.config, that indicates the overall configuration
portion of the COM which is not safety-related.
•
root.config indicates the entire configuration including the
remote I/O modules (CPU and COM).
4. Backup the project and make note of the user program name,
Configuration CRC of the CPU and date it.
This does not replace the user’s documentation requirements.
5. Create a backup of every controller.
Program Identification
The application program is clearly identified by the top level
root.config Controller Overview. The related backup can thus be
clearly determined. The identification of a backup should contain the
configuration CRC of the controller.
To make sure that the backup is unmodified, first compile the backup,
and then compare this newly generated code version with the code
version of the program loaded in the controller. The comparison can
be displayed by using RSLogix Guard PLUS! software.
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