1769SM2 communication

[karthikolive]

How to get data from AC20 Controller - SSI Super Systems (PV and SP) using 1764-28BXB & 1769SM2. Plz Send me sample program.

 

[Ken Roach]

That's not a whole lot to go on, but Google is remarkable.

Is this the AC20 single-loop controller you are referring to?

http://www.supersystems.com/single_loop_controllers.html

The Set Point values are in the Modbus reference manual for the AC20:

http://www.supersystems.com/AC20_COMMS.PDF

Page 18 says that the Main Set Point is Modbus address 138.

What exact parameter do you want to read as the "PV" ? The AC20 Modbus user manual says on page 37 that it can run with the Carbon Potential, Dew Point, or Sensor Output (millivolts) as the primary control variable.

The more detail you put into your request the better data you can get from the Forum.