User Manual

Chapter 9: Diagnostics and Troubleshooting
U ser 's M a n u a l 0 300 21 5- 03 R ev. 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. Possib le causes of an
out-of-range condition incl ude:
•
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 p a ge 6-3 for more details.
Sec t ion 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 conditio ns are indicated in the
module input data table.
Critical module erro r s are conditions that may prevent norm al or recoverable opera tion of
the system. When these types of errors occur, the system typically leaves the run or
program mode of operatio n until the error can be d ealt with. Critical module errors are
indicated in Table 9-4 (Extended Fault Codes).
Sec t ion 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 Er ror E xtended Error Informati on
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 err ors into three distinct
groups, as described in the table below. The type of error determines what kind of
information exists i n the extended er ror 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.