Micromod MOD: 30ML and Modcell Maintenance for 2001N, 2002N, and 1800R - Manual (Page 76)

MOD30ML and Modcell Maintenance Manual
DIAGNOSING I/O MODULE PROBLEMS
5.3 INTERPRETING EXTENDED ERROR CODE DATA
Each analog I/O module updates the extended error data in the database only when an error
occurs. Thus, the error data returned when reading EXTERR represents one of three
conditions:
1. The reported data is current and there is a problem in the module.
2. The reported data applies to a previously corrected error and the database has not been
updated because a new error has not occurred.
3. The reported data is 0 (no error) because no error has occurred since the last database
download from the Application Builder. The EXTERR value is always set at 0 on
download.
If condition 1 or 2 exists, determine if the error is current by writing a 0 to the EXTERR
attribute. If a current problem exists, a subsequent read should return the error code number
instead of the 0.
If condition 2 or 3 exists the data is not current and should be ignored. Also note that
because the data is not current, the reported Status Bit information may not represent the
actual current status of the module.
When it has been established that a current problem exists, refer to Table 10 or 11 for
additional information and recommended action.
5 -3