Modbus write error

[didac]

Hello,
I have a problem. I updated genohm-scada-modbus package version 20230404 to 20240621 and FW version 20230607 to 20240426. Now I run a write command and I get this error: "Write failed: Illegal data value". The only change in Modbus profile is to add write_delay:1 in the file header. I also tried package 20231213 and I have the same error. The error doesn't always occur, ometimes write correctly. It is possible to know which mapping element triggers the error?

Code:

{
  "manufacturer": "TEST",
  "description": "Modbus",
  "timeout": 5,
  "read_swap": "n", 
  "write_delay":1,
  "mapping": [
        {"name": "Allow Heating_[R/W]",
    "bus_datatype": "bool",
    "type": "register",
    "datatype": "uint16",
    "address": 47371,
    "writable": 1,
    "write_multiple": 1,
    "read_count": 1,
    "value_delta": 1,
    "value_multiplier": 1,
    "value_custom": {
            "0": "Off",
            "1": "On"
            }     
    },
    {"name": "Allow Cooling_[R/W]",
    "bus_datatype": "bool",
    "type": "register",
    "datatype": "uint16",
    "address": 47372,
    "writable": 1,
    "write_multiple": 1,
    "read_count": 1,
    "value_delta": 1,
    "value_multiplier": 1,
    "value_custom": {
            "0": "Off",
            "1": "On"
            }         
    }
]}

[Daniel]

Use this
https://forum.logicmachine.net/showthrea...8#pid35418
PS. You don't need read_count

[didac]

Use this
https://forum.logicmachine.net/showthrea...8#pid35418
PS. You don't need read_count

i'm using this version of package

[admin]

Most likely the problem is on the physical communication level. Do you have GND connected between LM and Modbus device?

[didac]

What does this error mean? Can I know which profile item triggers it? We haven't changed anything physically, we just updated the firmware and package. It was working correctly before.

[Daniel]

If it worked, why did you need write_delay?

[didac]

Because sometimes we got a timeout error. But not this illegal value error.

[admin]

Random timeouts usually mean that the end device does not always receive the message correctly. Do you have GND connected between LM and Modbus device?

[didac]

The error only occurs when I send the same value that the parameter currently has. If the value is different i don't have the error. I will check the physical device.

Thanks!

[admin]

In this case you can simply ignore "illegal data value" errors. Looks like this is simply a device "feature".