Observing and tracing faults

The software acts as if it was a processor, down to telling you if the program faults. When the software detects a program fault, it displays a fault dialog.

The fault dialog indicates:

• which program file had the fault (the name of the program is displayed in the title bar of the dialog)
• the type of fault (in this case, the watchdog timer timed out)
• the location of the instruction that was executing when the fault occurred (program file, rung number, instruction)

You can keep the dialog on-screen as long as necessary to trace the fault in your ladder logic. When you have recorded where the fault occurred, click OK to close the dialog.

When a fault occurs, and you are online with the ladder logic through PLC-500 A.I. Series, PLC-5 A.I. Series, RSLogix 5, RSLogix 500, or WINtelligent LOGIC 5, you can trace the fault as if you were online with a processor, using the processor status displays to track the fault to its source, and clear the fault.