Configuration/settings
User manual 55530_hdb_en_16 60 / 156
Device
Tab. 8-4: Diagnostic submodules for device
Qualifier DI, qualifier DO and system state are diagnostic information. Diag-
nostic information is available to the user program via the process image of
the inputs (PII).
Each qualifier bit is allocated to a channel and provides information about the
validity of the value (0 = value is invalid).
The system state provides the error value corresponding to the current diag-
nostic.
Example: if there is a sensor short circuit at a digital input, the reference data
signal is logically "0".
Due to the short circuit diagnostic, the module also sets the relevant bit in the
qualifier to "0" and, in the system state, the value to 0x0010 (sensor short cir-
cuit on at least one channel).
By querying the values, you can establish which channel (qualifier) it is and
why the data are invalid (system state).
For further information about diagnostic messages in Tab. 9-21: "General di-
agnostic messages - error types, meaning and action"
Diagnostic submodules
Qualifier DI 2 bytes In
Diagnostic status of the individual bits of the inputs
in "Digital IO".
0: invalid
1: valid
Lay
out according to parameter settings
Qualifier DO 2 bytes In
Diagnostic status of the individual bits of the outputs
in "Digital IO".
0: invalid
1: valid
Lay
out according to parameter settings
System state 4 bytes In
Summary of the current system status.
For further information, please refer to Tab. 8-19:
"System state IO layout".
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