System status indicators – Rockwell Automation 1755-OF8 GuardPLC Controller Systems User Manual
Page 143
Publication 1753-UM001C-EN-P - March 2010
143
Diagnostics Chapter 15
GuardPLC 1600 and
GuardPLC 1800 Controllers
and GuardPLC Distributed
I/O
System Status Indicators
FAULT
On
The routine logic has caused an error.
The controller configuration is faulty.
The upload of a new operating system was not successful and the operating system is corrupted.
Flashing
An error has occurred during a Flash ROM write cycle.
One or more I/O errors have occurred.
Off
None of the above errors have been detected.
COMMunication
On
The programming terminal, with Administrator or Read/Write access, is communicating with the
controller via an Ethernet link.
Off
No communication or read-only communication on an Ethernet link.
Indicator
State
Description
RUN
24V DC
PROG
ERROR
FAULT
FORCE
BL
OSL
Indicator
State
Description
24V DC
On
24V DC operating voltage present.
Off
No operating voltage.
RUN
On
This is the normal status of the controller.
A routine, which has been loaded into the controller, is executed.
The controller processes input and output signals, carries out communication and performs hardware
and software tests.
Flashing
The controller is in Stop mode and is not executing a routine.
All system outputs are reset.
Stop mode can be triggered by setting the Emergency stop system variable to TRUE in the routine, or
by direct command from the programming software.
Off
The controller is in Failure_Stop (see ERROR).
ERROR
On
A hardware error has been detected by the controller. The controller goes to Failure_Stop and the
execution of the routine is halted. Hardware errors are errors in the controller, errors in one or more of
the digital input and output modules, or errors in the counters.
A software error in the operating system has been detected by the controller.
The watchdog has reported an error due to exceeded cycle time.
All system outputs will be reset and the controller ceases all hardware and software tests. The
controller can only be restarted by a command from the programming software.
Off
No errors are detected.