Analog Input Tag Type Properties: I/O Tab
The I/O Tab contains the properties used to identify and establish a connection to the communication driver tag being used to exchange data with your physical I/O device (e.g. PLC or RTU). This is accomplished by identifying the communication driver tag that communicates with the physical I/O device, the address at the physical I/O device from which this tag is to read its data, and the rate at which the I/O device should be scanned for data.
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Select the communication driver tag from which data will be read.
The tag button to the right of the field opens the tag browser, from which you can either select an existing communication driver tag or add a new one. The X button will clear the field. Right-clicking on a tag in the field will open a dialog from which you can the driver`s properties.
Provide the address within I/O device from which this tag is to read data. This value must match the configuration of your PLC or RTU hardware.
The addressing system for each of the drivers that come with VTS is provided in the Communication Driver Tags section of this guide.
Provide the frequency, measured in seconds, that the I/O device should be scanned for new data.
Provide units of measure that the input data represents. Possible values for this field include "rpm" "degrees C", "%", etc.
This optional field allows you to provide a constant value that will be used instead of input read by the communication driver. It is commonly used when testing a new Analog Input tag when application is not attached to a live data source. Tags that are using manual data are marked on screen by a flashing exclamation mark.