Rockwell Automation 57C409 2 Channel Analog Input Module - Manual (Page 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 stoppedanderror code 1b"
appears on the faceplate of the processor module. A hardware
interrupt has occurredbut 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 stoppedanderror 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.