The function ReadPointValue (_ReadPointValue@8 in the Stdcall call convention) is optional and it is called to get the value of defined I/O tag after writing a new value using the function WritePointValue.
Return code
Code
Description
RQ_OK
Request executed OK.
RQ_ERR
An error occurred (the device does not communicate or is out of service, or there is any error), the station changes into the state COM_ERR, or HARD_ERR after returning from the function.
RQ_IGNORED
The function was ignored and the station status is not changed.
Pridať komentár