This function can be run on every program cycle, but is suggested to be run only when the data is changed / received. The status of the PGN is 2, when the data is ready.
Supported platforms: CODESYS 2.3, CODESYS 3.5
This function translates DTC message data from the four possible dialects to SPN/FMI pairs.
The dialect is given to the function as an input, but if the CM bit of the raw data is FALSE, the given dialect is overridden and the function uses dialect 4 instead.
Function is used when receiving J1939 device's DM log (e.g. DM1).
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This function can be run on every program cycle, but is suggested to be run only when the data is changed / received. The status of the PGN is 2, when the data is ready. |
Input variable name |
Data type |
Range |
Description |
i_SPNFMIConversionMethod |
WORD |
1..4 |
SPN/FMI pair conversion method according to J1939 specification |
i_pDTC_Data |
POINTER TO DWORD |
- |
Pointer to raw diagnostic trouble codes data |
i_NumberOfDTC |
BYTE |
1..16 |
Number of diagnostic trouble codes to translate |
i_pSPNFMI_Data |
POINTER TO J1939_SPNFMI |
- |
Pointer to array where SPN/FMI codes are decoded to |
Data type |
Range |
Description |
INT |
- |
Negative, when error |
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Application code example for converting DM1 log's DTCs to SPN-FMI values is included in Using J1939 topic. |
Source file Topic000443.htm
Last updated 24-Apr-2025