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.
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