BME AHO0412 HART output setup in Control Expert examples

[jamesdlane986]

Hello,

I'm doing a sizable hardware and software migration project for a client. Besides all the configuration and programming to migrate from Proworx32 and Quantum hardware to the X80/M580 and Control Expert, I am adding 5 AHO0412 modules that will be interfaced with flow and pressure control valves with a Flowmaster Beta positioner HART compatible controller. I'm looking for some basic PLC code examples for interfacing the AHO0412 module to any HART compatible controller. I have an M584040 CPU, 5 BMEXBP1200 backplanes, 

[ciupol]

Hello jamesdlane986,

There are few things to consider when using HART modules:

1. Make sure you install HART module in an ethernet slot on the backplane - not all slots on ethernet backplane are ethernet compatible (sic!). The ethernet compatible slot have two connectors vs on connector on non compatible slots.

2. In Control Expert you add HART module as any other module. I would suggest adding the module as Device DDDT and not topological (selection box on the bottom of the window where you select the module).

3. You can change Device DDT name in the module configuration window. I typically use something more descriptive than default name:

4. You have to add the module under the CPU in DTM browser. You can configure HART Device DDT name when you double click the processor, go to Device List, and click HART module. Again I make it more descriptive than default name.

5. After doing the above two Device DDTs are created in Data Editor:

The first one is standard DDT for analog module. That is where you can see 4-20mA channels.

The second one is where you can see HART Dynamic Variable (PV, SV, TV, QV).

6. Finally to make it all work, in DTM browser right click on the CPU and select Device Menu -> Additional functions -> Store Device Conf to FDR. To execute this step you have to be connected to CPU through ethernet port (not USB).

There is really no special logic to make it work. You just grab the value from Device DDT and map it to a variable.