Technical data

W&T

Subject to errors and modifications

VT_BOOL: Binary value

VT_I2, VT_I4: Whole number (16bit/32bit)

R: Read-only

VT_R8: Floating point number

W: Write-only

VT_BSTR: Character string

3.11.7 OPC variables for Web-IO Analog

Each Web-IO Analog has two ports for current and/or voltage

depending on the model. Configuration settings can also be

used to scale a connected sensor, and instead of current or

voltage the device then provides the measurement values of

this sensor in any other physical unit. The OPC server does not

determine which unit this is from the device until it is running,

and correspondingly little can be said ahead of time about the

associated variables:

Analog.0 - 1 (VT_R8, R): Sensor measurement values. The unit

is user-definable. The OPC client can read it out during run time

as a text (e.g. „mA“) from the Item Properties.

Web-IO Analog-In/Out provides two sensor values.

Please note also the general notes for describing the OPC vari-

ables.