“Qualifier bits” allow the SafetyProvider to indicate the correctness of values on a fine-grained level. It is good practice to attach a qualifier bit to each individual value sent within an SPDU. The qualifier bits are part of the SafetyData and hence not within the scope of this document.
[RQ6.16] However, whenever qualifier bits are used, the values shown in Table 27 shall be used, i.e., 0x1 for a valid value (“good”), and 0x0 for an invalid value (“bad”).
Table 27 – Example “Application Variables with qualifier”
Value |
Qualifier |
valid |
0x1 (= good) |
invalid |
0x0 (= bad) |
Checking the qualifier is done in the safety application.