Update,

I have now tried a 3rd Monarco and it works as perfectly as the second. How can I test the 1st Monarco to see if it has a fault?

Cheers

Mike

Update.

I have done some testing on the two new Monarco I have. I'm not sure what is correct but my findings are.

On an older Monarco I have, there is continuity between the pi and the aluminum case of the Monarco. I do not see any voltage leak on this. I think this is because the HDMI port is pressing against the case, providing a ground link.

On the two new Monarco there is no continuity between the pi and aluminum case. None of the Pi touches the case so it is isolated.

This might be normal, it is just something I have never observed before!

Should the Pi be grounded to the aluminum case?

Cheers

Mike

Hi Tomas

I solved this by swapping the Monarco for one that I know works. Could that Monarco have an issue, it's new? It's the same one mentioned with the strange voltage leak I posted about, https://forum.rexygen.com/topic/209/leakage-from-usb

Cheers

Mike

@cechurat Hi Tomas,

here is the log from the Modbus

Modbus Log.csv

I get an initial reading then the comms seems to fail.

Cheers

Mike

@cechurat Hi Tomas,

Thank you, looks good. I will give that a try.

Cheers

Mike

Hi All,

For the SVG-TRND in REX HMI you can name the data signals from coming from the TRND block

Can you do the same for the data you extract from the Archive or TRND block, so the CSV has the proper signal data tiles?

Cheers

Mike

@cechurat Hi Tomas,

I have grounded the aluminum case the Monarco HAT comes in. Yet I still have this odd leakage. It's the same Monarco as the one I am having strange Modbus issues with.

Cheers

Mike

Hi All,

I get some kind of voltage leakage from a Monarco HAT when I touch the USB ports and the metal enclose I have it installed in. Is this normal? I am powering it off a 24Vdc power supply

Cheers

Mike

Hi All,

I am using an NTC sensor module that I have used before with no issues. I now get this issue where the module (slave 1) seems to not work. I get a reading on val0 but it will not update, val1-9 are not plugged in but show the correct error value for open circuit, -500. If I place the cursor over the val0 it shows the reading but in red, sometimes orange. I have looked in the system log and it says that slave 1 is not responding. But I do seem to get an initial reading and the block itself never shows red when the cursor is over it. The valve of val0, 200 is 20 degC which would be correct. Any ideas what could be wrong here?

Cheers

Mike

Hi All,

I have made this kwh sub system. The kwh value on the meter I am using can't be reset so I'm doing the calc in the PLC program. using Modbus to get data from the meter. But I'm not convinced it's right! Although the numbers I get from it look ok. What do people think?

Cheers

Mike