ControlLogix Power-Up Handler

Karlore · Mar 31, 2016

Hello all, thanks for taking time to read this. I'm having an issue with testing the power-up handler and I cannot get a fault to occur. In the power-up program, I have configured a main task and a fault task. In the main task I have a single rung which JSR's to the fault task with a code of 999. I expect that when I download then place the PLC in run, that this should trigger a fault, but it doesn't. Another piece of information is that I'm running the PLC in RSEmulate. Is there something else I'm missing?

AA_Ron · Mar 31, 2016

Make sure your JSR is set correctly to go to the Subroutine file.

Karlore · Mar 31, 2016

AA_Ron said:
Make sure your JSR is set correctly to go to the Subroutine file.

Hi AA_Ron, the JSR is in the main task of the power-up handler program and the RoutineName is configured to the FaultRoutine task.

AA_Ron · Mar 31, 2016

I'm gonna have to jump on my laptop and simulate what it is your doing.

nhatsen · Mar 31, 2016

Karlore said:
Hello all, thanks for taking time to read this. I'm having an issue with testing the power-up handler and I cannot get a fault to occur. In the power-up program, I have configured a main task and a fault task. In the main task I have a single rung which JSR's to the fault task with a code of 999. I expect that when I download then place the PLC in run, that this should trigger a fault, but it doesn't. Another piece of information is that I'm running the PLC in RSEmulate. Is there something else I'm missing?

When the controller detects a fault, the control jumps to the fault routine. I think that jumping directly with a JSR to the fault won't trigger any fault: it's just like jumping to any routine.

If you want to generate a fault, just try doing an out-of-index operation on the main routine.

Karlore · Mar 31, 2016

nhatsen said:
I think that jumping directly with a JSR to the fault won't trigger any fault: it's just like jumping to any routine.

According to Rockwell's Manual on P. 28, this is exactly how you're supposed to test faults.

Edit: I just noticed that this will only simulate the routine and not generate an error (P.27) but the wording below it is misleading. Does anyone know if this will actually trigger a fault?

PapaSmiff · Mar 31, 2016

Time for me to ask a stupid question: is your rung unconditional or is it set up exactly like the manual shows? If it's just like the manual, did you toggle Tag_1.0?

Another stupid thought: check the spelling of your fault task in your JSR to ensure it matches the actual name of the task.

Operaghost · Mar 31, 2016

The Power Up Handler is a specialized task. It is used to run logic whenever the controller powers up. It does not execute on a transition from Program to Run which is what is happening when you are downloading. I don't know that the emulator can simulate a power cycle.

And your terminology may be confusing things too.

A Routine is found in a program and contains logic
A Program is found in a task and is used to store and organize routines
A Task organizes the programs and determines what runs when

I think you are saying "task" when you mean "routine". The JSR means Jump to SubRoutine.

OG

Karlore · Mar 31, 2016

PapaSmiff said:
Time for me to ask a stupid question: is your rung unconditional or is it set up exactly like the manual shows? If it's just like the manual, did you toggle Tag_1.0?

No problem, yes, similar to the manual with a single bit to JSR to the FaultRoutine. The rungs are powered.

Karlore · Mar 31, 2016

Operaghost said:
I think you are saying "task" when you mean "routine". The JSR means Jump to SubRoutine.

OG

Yes, you are correct, I meant routine when I said task.

ControlLogix Power-Up Handler

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