Programmer (HHP) User guide

20
Chapter
20–1
Troubleshooting Your System
This chapter describes how to troubleshoot your controller. Topics include:
• understanding the controller LED status
• identifying HHP errors
• using the trace feature
• controller error recovery model
• identifying controller faults
• recovering your work
• calling Allen-Bradley for assistance
Between the time you apply power to the controller and the time it has to
establish communication with a connected programming device, the only
form of communication between you and the controller is through the LEDs.
When Operating Normally
When power is applied, only the power LED turns on and remains on, as
shown on the left in the figure below. This is part of the normal power up
sequence.
When the controller is placed in RRUN mode, the run LED also turns on and
remains on, as shown on the right in the figure below. If a force exists, the
force LED is on as well.
When powered up:
FAULT
FORCE
POWER
RUN
When placed in RRUN:
FAULT
FORCE
POWER
RUN
Refer to the following key to determine
the status of the LED indicators:
Indicates the LED is OFF.
Indicates the LED is ON.
Indicates the LED is FLASHING.
Status of LED does not matter.
Understanding the Controller
LED Status