RedLion PaxDP10 via Modbus RTU

[gfulk]

Hello,
I am currently developing an app that will connect to a RedLion Panel Meter used to display compression values. Once the compression hits a setpoint set in the meter a coil will change states and fires a solenoid.

This meter does not handle the Modbus Function code FC01 for reading coils. This coil has a mirror register(40021) and a bit(bit 3) within that register that changes when this coil fires. I have tried drilling down to the bit level visa the .Net framework BitArray class and the BitVector32 struct . I tried to display the entire register as a ushort on screen and no change when the setpoint was fired .

I have tested getting the bit and the word change visa a small Indusoft app using their built in Modbus RTU driver. I saw the change in the register and the bit going this route of comms.

If you need code snippets or any other information I am happy to send.

Thanks,

[Archie]

Add a BasicLabel to the form and set PLCAddressValue to 40021
Add a second BasicLabel to the form and set PLCAddressValue to 40021.3
Run the app and see what the BasicLabels show

[gfulk]

Archie,
Thanks for getting back to me, I have already tried this and there is no change.

[Archie]

Try address 44021

[gfulk]

No luck

[Archie]

Maybe 44022

[Archie]

I had the opportunity to look at the manual and it looks like they are showing Modicon style addressing which means 40021 should be correct.

If you use a BasicLabel with address 40001, do you get a value?

Also set the EnableLogging property to True. After you run the application you will get a driver log file in the same directory as the executable. Post that file.

[gfulk]

After doing more research I found that i had to bring it over as a "u40021". I am now returning the proper value.