Instruction Manual

142 Publication 1753-UM001C-EN-P - March 2010
Chapter 15 Diagnostics
GuardPLC 1200 Controller
Status Indicators
The GuardPLC 1200 controller has these status indicators.
PLC
1200
Indicator State Description
INput On Digital input channels are high (10 … 30V DC).
Off Digital input channels are off.
OUTput On Digital output channels are high.
Off Digital output channels are off.
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 system variable AB-CPU/Emergency Stop to TRUE in
the routine, or by direct command from the programming terminal.
Off The controller is in Failure_Stop (see ERROR).
ERROR On • A hardware error has been detected by the controller. In this case the controller goes to
Failure_Stop and the execution of the routine is halted. Hardware errors are errors in the
controller, in one or more of the digital input and output modules, or in the counters.
• A software error in the operating system has been detected by the controller.
• The watchdog has reported an error because of 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 terminal.
Flashing If all the status indicators are on and ERROR blinks, the boot loader detected a corrupted
operating system and is waiting for an operating system download.
Off No errors are detected.
PROGress On The upload of a new controller configuration is in progress.
Flashing The upload of a new operating system into the Flash ROM is in progress.
Off No upload of controller configuration or operating system is in progress.
FORCE On The controller is executing a routine (Run) and Force mode is activated by the user.
Flashing The controller is in Stop mode, but forcing has been saved and will be activated when the
controller is started.
Off Forcing is off.