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We are using Vijeo Citect SCADA V7.20 for one of our project, we have one Barcode reader which has the Ethernet port. SCADA needs to communicate with this deivce.

When you want to communicate a barcode reader with Vijeo Citect SCADA then you should first have the information about the communication protocol which you can use like if Serial , USB, ethernet .
Typical barcode readers use RS232 communications protocol. Within Vijeo Citect, you can define a COMX board and the appropriate Port and write a custom cicode using the ComRead() Cicode function
to read data back from the barcode reader. Alternatively you can also use the ASCII driver. 
In the event you are using a USB or ethernet type barcode reader, where COM port is not available, you will need to ensure that the manufacturer of the barcode reader provides software that can
convert the USB port into a virtual com port for the communication. 
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