Porovnávané verzie
porovnané s
Kľúč
- Tento riadok sa pridal
- Riadok je odstránený.
- Formátovanie sa zmenilo.
Declaration
| Blok kódu | ||||
|---|---|---|---|---|
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unsigned int _stdcall WritePointValue(struct StationPar * St, struct PointPar * Pt, struct KomUniVal * Val, unsigned int * RdBack) |
Parameters
| St | Pointer to the StationPar structure. |
| Pt | Pointer to the PointPar structure. |
| Val | Pointer to the KomUniVal structure (contains a new value). |
| RdBack | Pointer to a Boolean value of the request attribute of the function ReadPointValue. |
Description
The function WritePointValue (_WritePointValue@16 in the Stdcall calling convention) is optional and called to write a new value into defined output I/O tag. After successful writing, the I/O tag will change into the status Transient (see the item Status in KomUniVal structure). The I/O tag will change back to the normal status (InLimit, ...) after the backward reading a value from the device. If a user requires the backward reading (calling the function ReadPointValue), it is necessary to write a non-zero value to into the parameter RdBack (if the parameter is zero, then calling the function ReadPointValue is disabled).
Return code
| Code | Description |
| RQ_OK | Request executed OK. |
| RQ_ERR | An error occurred (a device does not communicate or is out of service, or there is any error), the station changes into the status COM_ERR or HARD_ERR after returning from the function. |
| RQ_IGNORED | The function was ignored and the station status is not changed. |