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+--- Thread: Modbus RTU doesnt will work fine (/showthread.php?tid=3618)
Modbus RTU doesnt will work fine - Dré - 14.10.2021
Hi,
I have a ABB B21 energy meter. I was trying to read it with my LM.
I can find it with the RTU scan.
I was trying to make a Json script, but all see are the same values, and if i look at the energy meter i dont see this value.
the value i see is -327.680.
I dont know how to find the problem.
I check the settings of the modbus, like baudrate [115200], parity [Even], dublex [Half-dublex].
I was tasting with script code of this
Code:
{
"product_code": "ABB_B21",
"mapping": [
{
"bus_datatype": 14,
"address": 5000,
"value_nan": [
65472,
0
],
"type": "register",
"units": "kWh",
"name": "Active import",
"datatype": "float16"
},
{
"bus_datatype": 14,
"address": 5004,
"value_nan": [
65472,
0
],
"type": "register",
"units": "kWh",
"name": "Active export",
"datatype": "float16"
},
{
"bus_datatype": 14,
"address": 5008,
"value_nan": [
65472,
0
],
"type": "register",
"units": "kWh",
"name": "Active Net",
"datatype": "float16"
},
{
"bus_datatype": 14,
"address": 5009,
"value_nan": [
65472,
0
],
"type": "register",
"units": "Kvarh",
"name": "Reactive Import",
"datatype": "float16"
},
{
"bus_datatype": 14,
"address": 5010,
"value_nan": [
65472,
0
],
"type": "register",
"units": "Kvarh",
"name": "Reactive Export",
"datatype": "float16"
},
{
"bus_datatype": 14,
"address": 5014,
"value_nan": [
65472,
0
],
"type": "register",
"units": "Kvarh",
"name": "Reactive Net",
"datatype": "float16"
},
{
"bus_datatype": 14,
"address": 5018,
"value_nan": [
65472,
0
],
"type": "register",
"units": "Kvarh",
"name": "Apparent Import",
"datatype": "float16"
},
{
"bus_datatype": 14,
"address": 5019,
"value_nan": [
65472,
0
],
"type": "register",
"units": "Kvarh",
"name": "Apparent Export",
"datatype": "float16"
},
{
"bus_datatype": 14,
"address": 5020,
"value_nan": [
65472,
0
],
"type": "register",
"units": "Kvarh",
"name": "Apparent Net",
"datatype": "float16"
},
{
"bus_datatype": 14,
"address": 5024,
"value_nan": [
65472,
0
],
"type": "register",
"units": "kg",
"name": "Active Import CO2",
"datatype": "float16"
},
{
"bus_datatype": 14,
"address": 5034,
"value_nan": [
65472,
0
],
"type": "register",
"units": "currency",
"name": "Active Import Currency",
"datatype": "float16"
}
],
"manufacturer": "ABB",
"name": "B21",
"product_range": "PM",
"description": "Power Meter P21 1 fase"
}and im not sure about the the adress: 5000
at the manual of the energy meter it says
Start reg (Hex) adress 5000
do i use 5000 for the script above or do i need to convert it to decimal and is it 20480, if not how do i need to convert adres 5B00 to LM address?
* i also tried address 20480 with the read test in the LM.
manual ABB B21
RE: Modbus RTU doesnt will work fine - Daniel - 14.10.2021
Use decimal and datatype should be uin64 or int64 depend of the type. You may need to subtract 1 from the address. Always make it work with test read before making the profile.
RE: Modbus RTU doesnt will work fine - admin - 14.10.2021
You also need to remove "value_nan" fields and add "value_multiplier": 0.01 (or a different value for certain registers, check the documentation).
RE: Modbus RTU doesnt will work fine - Kilogica - 20.10.2021
Also check what version of B21 you have,
I think there are three of them: steel, silver and gold.
The only difference is the lack of some parameters, so it is possible that you're reading something that is not there.
RE: Modbus RTU doesnt will work fine - Dré - 12.12.2021
Sorry for late reaction, thanks all it is working with all of your inputs