Rockwell-automation 57C409 2 Channel Analog Input Module Manual do Utilizador descarregar pdf (Página 30)

5Ć4

Step 3. Verify that the hardware is working correctly.

Systematically swap out the input module, the processor

module(s), and the backplane. After each swap, if the

problem is not corrected, replace the original item before

swapping out the next item.

5.3.3 Hardware Event Count Limit Exceeded

Problem: All tasks in the chassis are stopped and error code 1b"

appears on the faceplate of the processor module. A hardware

interrupt has occurred but no task is waiting. Use the following

procedure to isolate the problem.

Step 1. Verify that the user application program is correct.

Verify that your interrupt response task contains either a

WAIT ON event" or CALL SCAN

LOOP" statement that

will be executed. Check carefully to determine whether a

higher priority task is preventing the interrupt response

task from running. Make certain that the ordering of your

statements agrees with the examples in section 4.4 and

that the lowest priority task enables common clock.

Step 2. Verify that the hardware is working correctly.

Systematically swap out the input module and the

processor module(s). If the problem persists, take all of

the modules except one processor module and the input

module out of the backplane. If the problem is now

corrected, one of the other modules in the rack is

malfunctioning. ReĆconnect the other modules one at a

time until the problem reappears. If none of these tests

reveals the problem, replace the backplane.

5.3.4 Illegal Interrupt Detected

Problem: All tasks in the chassis are stopped and error code 1F"

appears on the faceplate of the processor module. A hardware

interrupt has occurred but no event has been defined. Use the

following procedure to isolate the problem.

Step 1. Verify that the user application program is correct.

Verify that your interrupt response task contains an

EVENT statement to be executed. Check carefully to

determine whether a higher priority task is preventing the

interrupt response task from running. Make sure that the

ordering of your statements agrees with the examples in

section 4.4.

Step 2. Verify that the hardware is working correctly.

Systematically swap out the input module and the

processor module(s). If the problem persists, take all of

the modules except one processor module and the input

module out of the backplane. If the problem is now

corrected, one of the other modules in the rack is

malfunctioning. ReĆconnect the other modules one at a

time until the problem reappears. If none of these tests

reveals the problem, replace the backplane.

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