Rockwell-automation 57C409 2 Channel Analog Input Module Bedienungsanleitung PDF herunterladen (Seite 29)

5Ć3

5.3 Interrupt Problems

Problem: No interrupts at all, or too many (unexpected) interrupts,

signified by error codes being displayed on the faceplate of the

Processor module. Go through the following steps first before going

on to the more specific troubleshooting steps:

Step 1. Verify that the input module is in the correct slot and that

the I/O definitions are correct.

Refer to figure 3.2. Verify that the slot number being

referenced agrees with the slot number defined in the

configuration.

Verify that the configuration task contains the proper

interrupt control definitions.

Step 2. Verify that the user application program is correct.

Verify that the application program that uses the symbolic

names assigned to the module in the configuration task

has defined those names as COMMON.

Compare your interrupt task with the examples given in

sections 4.4.1 and 4.4.2. Make sure that the actions shown

in the examples are performed in the same order in your

program.

5.3.1 No Interrupts

Problem: The program does not execute but no error codes are

displayed on the Processor module faceplate. If interrupts are never

received by the application program and the watchdog timeout

parameter in the event definition was disabled, the program will never

execute.

The watchdog timer for this module must never be disabled. Before

you can determine why the program did not execute, you must first

set the timeout parameter in the event definition. Run the program

again and proceed to section 5.3.2.

5.3.2 Hardware Event TimeĆOut

Problem: All tasks in the chassis are stopped and error code 12"

appears on the faceplate of the processor module. The interrupt has

either never occurred, or is occurring at a slower frequency than the

value specified in the timeout" parameter in the event definition. Use

the following procedure to isolate the problem:

Step 1. Verify that the timeout value is set correctly.

Check the value specified in the timeout" parameter in

the event definition. The unit is in ticks. Each tick is equal

to 5.5 msec. The timeout value should be at least 2 ticks

greater than the interrupt frequency. It can reasonably

range up to 1.5 times the interrupt frequency.

Step 2. Verify that the user application program is correct.

Review the examples in section 4.4. Make certain that

common clock has been enabled.

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