Introduction, Controller modes, Chapter 13 – Rockwell Automation 1755-OF8 GuardPLC Controller Systems User Manual
Page 113: Controller configuration and modes of operation, Introduction controller modes, Chapter
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Publication 1753-UM001C-EN-P - March 2010
113
Chapter
13
Controller Configuration and Modes of
Operation
Introduction
The GuardPLC operating system is stored permanently in the memory
of the controller. The operating system is designed to make sure that
all tasks of the controller are performed in a safety-related way.
You have access to the controller via the RSLogix Guard PLUS!
software so that you can define the functionality of the controller.
Controller Modes
The controller can operate in various modes. These modes depend on
the results of the tests of the hardware, software, and the system
configuration.
After you apply power to the controller or restart the controller, the
controller first performs a system test of the data and address lines and
the flash and RAM memories. Then the controller checks the operating
system in the flash memory. During this time, the controller is in the
Init mode.
If all these initialization checks are OK, the operating system is started
and the controller changes to the Stop mode.
If any hardware or software errors are detected, the controller goes to
the Failure_Stop mode. If the check of the operating system detected
errors, the emergency loader starts. The emergency loader loads an
operating system from the programming terminal.
If the controller has a valid configuration and a routine downloaded to
the controller, the controller goes to the Stop mode.
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