PM8240 Modbus communication

[NelsonS7]

Hello everyone, I need to read parameter 3150 PFtot or the total power factor via Modbus communication from a PM8240, but it always returns 0. The meter reading is correct, however, the values ​​in register 3150 are both 0. I changed the configuration to IEC and it still didn't work. Is there any way to read the total power factor via Modbus?

[Mehran_Mehrnia · Accepted solution]

Hi @NelsonS7 

The PFtot value is a Float32, so you must poll it as a 32‑bit floating‑point value with word‑swapped order (Float32 Swapped). 

Please note that, some Modbus clients use 0‑based addressing, causing reads from register 3150 to return 0. If reading 3150 gives 0, try 3149 instead (0‑based vs. 1‑based offset). If your system uses the “4x” format, make sure you are actually polling 43150.

You can also, try reading Register 3110 (Frequency). If you correctly see 50.0 or 60.0, your Float and addressing settings are correct. If 3110 also returns 0, the issue is with your data type (Integer vs. Float32) or an addressing offset.

Best Regards,

-Mehran

L3 Expert Advanced metering

[NelsonS7]

Thank you for your support! You can read the data with record 3149! Thank you so much!