Allen-Bradley GuardPLC 1753, Safety Reference Manual

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Publication 1753-RM002C-EN-P - September 2008 95
Technical Safety for the Application Program Chapter 8
Program Documentation for
Safety Applications
You can print out the documentation of a project using RSLogix Guard
PLUS! software. The most important types of documentation are:
•
Interface declaration.
•
Variable list.
•
Logic.
•
Definition of data types.
•
Configurations for system, modules and system parameters.
•
I/O variable cross-reference.
•
Code generator information.
•
Network configuration.
Documentation is a component of a functional acceptance of a site
subject to approval by an approving board (for example TÜV). The
functional acceptance refers only to the application function, not to
the safety modules and controllers, that are type tested.
In the case of sites subject to acceptance, you should involve the
approval authorities in the project as early as possible.
Considerations for
DeviceNet Safety Data
In the HSP Signal Connection dialogs (in RSLogix Guard PLUS!
software), signals that are transferred over safety connections are
shown in white text on a red background. Signals transferred over a
standard connection are shown in blue text on a gray background.
The colorization only applies to the Connect Signals dialogs available
from the HSP protocol context menu. It is recommended that you use
a naming convention to visually distinguish between standard and
safety signals in the programming environment.
For example, use a prefix of std_ for any signals that are standard and
a prefix of safe_ for any signals that are safety-related.
IMPORTANT
Any safety tags that appear in the Standard Connect Signals
window must be treated as standard values in your application.
Any standard tags that appear in the safety Connect Signals
window must be treated as standard.
In order for a signal to be regarded as a safety value in your
application, the end device configuration must treat the signal
as safety and be transferred over a DeviceNet safety
connection.
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