Good Morning.

I am having trouble reading float values to Ignition from a Schneider Electric PM5400.

The modbus registers in PM5400 are 32bit. I can read these data through modscan (Swapped FP) but not in Ignition.

I have the following addresses in Ignition:

HRF43000

HRF43002

HRF43004

I get "GOOD" on quality so I know the connection is good but all the registers above come back -32768 or if I used:

HR43000

HR43002

HR43004

The values come back "0".

I have tried the "Reversed Word Order" in the advanced properties but it still does not work.

Hopefully,there are forum users that encountered these problems before and came up with a solution.

I can not configure through modscan, I do not understand where to get the id of my device. I tried to contact again via modbus poll (the result in the picture). as a result : the modbus poll contacted only device I didn't figure out which one as there are 5 pieces and they soedeniny consistently.


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We have an interface device from our canbus-devices to modbus. We also implemented a modbus over tcp/ip stack in it, and it works since years with several computers with our software as well as with modscan32.

Now i stumble over the following: Every about 50 to 60 seconds the connection is interrupted. With modscan i see, that there firstly is a message timeout, so it looks like my device doesnt answer any more. Next is a message, that the tcp/ip-connection was terminated.

The real strange thing is: - I have my WIN7-PC, and i have a VM with XP on it. - I open a connection mith modscan on my XP-VM, and it works stable - I open a second connection with modscan on my WIN7-PC, and it gets disconnected after about 50 to 60 seconds. - The first connection on my XP-VM stays connected and continues working fine.

b. In the interface device firmware i implemented a kind of "ethernet debug mode", that means, every action (open socket, close socket, receive data, send data etc.) is monitored to a RS232 connection. Here i can see, that my device "tells me", that the connection was closed by the remote station, which would be the WIN7 PC with modscan running. The procedure is as follows:

For about 50 secondes everything runs fine. Then modscan tells me, that there is a message timeout. When i watch the traffic on modscan (there is a traffic viewer in modscan, which of course is not comparable to wireshark), i see, that the query is transmitted but no response follows. At the same time my monitor function in the interface device tells me, that the connection was closed by the remote station. After about 7 to 10 additional queries modscan pops up a window telling, that the connection was disconnected.

When reading a float32 value from pymodbus I always get an incorrect value but when same value is read from modscan or ComTestPro, it is read correctly every time.This observation holds true for some registers only but for other registers pymodbus always reads the correct value with below code for float32 data only. be457b7860

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