Rockwell Automation 1755-OF8 GuardPLC Controller Systems - Manual (Page 114)

114 Publication 1753-UM001C-EN-P - March 2010
Chapter 13 Controller Configuration and Modes of Operation
To put the controller in Run mode:
•
set the Autostart switch of the both controller and the routine.
•
manually choose Run mode from the programming software.
If you stop the controller, it transitions from Run to Stop and
interrupts the execution of the routine. The outputs of the routine and
the I/O modules are reset to safe values.
You can use the Emergency Stop system variable to put the controller
in Stop mode by programming this variable in your logic or forcing it
when necessary.
The following table and flowchart summarize the controller modes.
Mode Description
INIT Safe state of the controller during initialization and the hardware tests after booting.
•
The controller is performing hardware and software tests.
STOP Safe state of the controller without execution of a routine.
•
A loaded routine is in the Stop mode.
•
The outputs of the controller have been reset (LOW).
•
The controller is performing hardware and software tests.
RUN The CPU is active.
•
The routine is being executed.
•
I/O signals are being processed.
•
The controller performs non-safety-related communication.
•
The controller performs software tests, hardware tests, and I/O module tests.
FAILURE_STOP Safe state of the controller after a system fault.
•
A loaded routine is in Stop or Failure_Stop mode.
•
The outputs of the controller are being reset (LOW).
•
The controller is not performing software or hardware tests.
•
The controller is being held in the safe state.
•
The hardware watchdog is not triggered.
•
To recover from Failure_Stop, a restart of the controller is necessary. A restart can be
initiated only via RSLogix Guard PLUS! software. See
Recover From a Failure_Stop on
page 116 .