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Wednesday, July 18, 2018
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SCADA, VB Datafetching from PLC
How to get data from PLC to my VB software through RS 485; have only 1 RS 485 port available.

Deed to get data from PLC (Delta EX2 or Delta SA2) to my VB software (in PC) through RS 485. I have got only 1 RS 485 port available which is connected to SCADA (Advantech). The VB is used only for report generation (SLAVE).


According to the user manual the Delta EX2 supports MODBUS ASCII.

A VB MODBUS ASCII driver/stack to communicate with the device will be needed. Then VB code to read the desired data, format the data, convert the data to a human readable text and output in some form.

Or you could purchase an HMI, like PeakHMI, that only needs configuration and use.


Good luck,