Allen-Bradley GuardPLC 1753, Safety Reference Manual

Page: 82 / 120

82 Publication 1753-RM002C-EN-P - September 2008
Chapter 7 GuardPLC Controller Operating System
Protection Against
Manipulation
You, in conjunction with the approving board, must define what
measures are applied to protect against manipulation.
Guard PLC Controllers and GuardPLC I/O Modules
Protection mechanisms are integrated in the PES and in RSLogix
Guard PLUS! software to prevent unintentional or unauthorized
modifications to the safety system.
•
A modification to the application program generates a new
(CRC) version number. These modifications can only be
transferred to the PES via download (PES must be in STOP).
•
You must be logged in to the PES to access operating options.
•
RSLogix Guard PLUS! software features a password link to the
PES upon user login.
•
The link between programming software and PES is not
necessary during RUN operation.
The requirements of the safety and application standards regarding
the protection against manipulations must be observed. The
authorization of employees and the necessary protection measures are
the responsibility of the operator.
PES data is accessible only if the computer uses RSLogix Guard PLUS!
software, and the application project is the currently running version
(backup maintenance). The link between programming software and
PES is necessary only for the download of the application program or
for reading out variable status and performing a reboot of the
controller to recover from a failure stop condition. The programming
software is not required for normal operation. Disconnecting the
programming software from the PES during standard operation
protects against unauthorized access.
ATTENTION
To protect the password against unauthorized access, modify
the default settings for both the login and password.