Rockwell Automation 1769-IT6 Compact I/O 1769-IT6 Thermocouple/mV Input Module - Manual (Page 78)

78 Rockwell Automation Publication 1769-UM004B-EN-P - March 2010
Chapter 5 Diagnostics and Troubleshooting
Non-critical versus 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 11 on page 80 .
Module Error Definition 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.
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.
Table 9 - Module Error Table
‘Don’t Care’ Bits Module Error Extended Error Information
15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0
0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0
Hex Digit 4 Hex Digit 3 Hex Digit 2 Hex Digit 1
Table 10 - Module Error Types
Error Type Module Error
Field Value
Bits 11…9
(binary) Description
No errors 000 No error is present. The extended error field holds no
additional information.
Hardware errors 001 General and specific hardware error codes are specified
in the extended error information field.
Configuration
errors 010 Module-specific error codes are indicated in the
extended error field. These error codes correspond to
options that you can change directly. For example, the
input range or input filter selection.