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Chapter 9: Diagnostics and Troubleshooting

User's Manual 0300215-03 Rev. A

9-3

9.4.2 Over or Under-Range Detection

Whenever the data received at the channel word is out of the defined operating range, an

over-range or under-range error is indicated in input data word 6. Possible causes of an

out-of-range condition include:

•

The input device is faulty.

•

The signal input from the input device is beyond the scaling range.

•

An open-circuit condition has been detected. Refer to page 6-3 for more details.

Section 9.5

Non-critical

vs. Critical

Module Errors

Non-critical module errors are typically recoverable. Channel errors (over-range or

under-range errors) are non-critical. Non-critical error conditions are indicated in the

module input data table.

Critical module errors are conditions that may prevent normal or recoverable operation of

the system. When these types of errors occur, the system typically leaves the run or

program mode of operation until the error can be dealt with. Critical module errors are

indicated in Table 9-4 (Extended Fault Codes).

Section 9.6

Module Error

Definition Table

Analog module errors are expressed in two fields as four-digit Hex format with the most

significant digit as “don’t care” and irrelevant. The two fields are “Module Error” and

“Extended Error Information”. The structure of the module error data is shown below.

Table 9-2 (Module Error Table)

1514131211109876543210

0000000000000000

"Don't Care" Bits Module Error Extended Error Information

Hex Digit 4 Hex Digit 3 Hex Digit 2 Hex Digit 1

9.6.1 Module Error Field

The purpose of the module error field is to classify module errors into three distinct

groups, as described in the table below. The type of error determines what kind of

information exists in the extended error information field. These types of module errors

are typically reported in the controller’s I/O status file. Refer to your controller manual

for details.

1 2 ... 164 165 166 167 168 169 170 171 172 173 174 ... 185 186

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