datahub_write
datahub_write — assigns a value to a DataHub point.
Syntax
datahub_write (pointname, value [, force, quality, timestamp])
Arguments
- pointname
- The name of the point, as a string.
- value
- The value to be assigned to the point—a
number, string, or array.
- force
- Causes the write to occur even if the
value and quality are the same as the value currently in
the DataHub. This is useful if you are changing only
the time stamp of the point. Enter t to force, or
nil to
not force.
- quality
- The quality of a point, as a number.
You can use the constants
OPC_QUALITY_* found in GetQualityName
by requiring that
file like this:
require("Quality.g");.
- timestamp
- The time stamp in Windows time. Windows
time is a floating point number that can be obtained in
Gamma by requiring
Time.g like this:
require("Time.g");, then calling the
functions GetCurrentWindowsTime,
UnixTimeToWindowsTime,
or PointGetWindowsTime.
Returns
t on success,
otherwise an error message.
Description
This function is the same
as the Gamma force
function, but the pointname is a
string, so the symbol never needs to be created in the
Gamma engine. This can be used to reduce Gamma engine
load when using a large number of points.
