Data sources
Writing to OPC UA
With the following statement the value of a variable on an OPC UA server may be changed with a script.
-- datasourcename.writevaule(NodeID, Value)
data.opcua.writevalue('ns=3;s="Data_block_2". "IntegersWords". "int1"', toint16(12))
The NodeID can be found in the “NodeID” field of the variable in the browse dialog of the OPC UA data source.
Note
The NodeID can also be created using UaExpert or a similar tool.
For the Peakboard Script Engine all numbers are equivalent. Therefore all numbers are processed as “double”. This means that these numbers cannot be stored on an OPC UA server without further ado.
Note
The Peakboard Script Engine knows only three data types: bool, number and string! Therefore a conversion according to the following table is necessary!
The following table provides an overview of the OPC UA data types and their corresponding conversion functions:
| OPC UA Datatype | Conversion Function |
|---|---|
| byte | tobyte() |
| sbyte | tosbyte() |
| float/single | tofloat()/tosingle() |
| int16/short | toint16()/toshort() |
| int32 | toint32() |
| int64/long | toint64()/tolong() |
| uint16/ushort | touint16()/toushort() |
| uint32 | touint32() |
| uint64/ulong | touint64()/toulong() |
| datetime | todatetime() |
| guid | toguid() |
