Modbus script problem - Timeout

[fleeceable]

Hi!

I'm facing some problems with modbus script over some time.
After some time (about week or two) communication goes to timeout (all reading/writing parameters). After I disable modbus script, enabling port on modbus tab, going to scan modbus devices on specific port (and system finds device with address), disable port on modbus tab, enable script again - everything starts to work again via script.

I attach code in here.
What can cause this?

Resident script with 10s sleep
Mitsubishi frequency converter

Code:

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require('luamodbus') vent_command = grp.getvalue('1/3/13') reset_command = grp.getvalue('34/1/4') control_motor = true motor_on = vent_command speed_value_perc = grp.getvalue('34/1/2') hz_sp = math.floor(speed_value_perc*50) mb = luamodbus.rtu() mb:open('/dev/RS485-2', 19200, 'E', 8, 1) mb:connect() mb:setslave(5) speed_read,err= mb:readregisters(202) --log('Speed read22',speed_read,err) read_mode,err= mb:readregisters(8) --log('Read mode',read_mode,err) read_speed,err= mb:readregisters(13) log('Read speed',read_speed,err) read_inputs,err= mb:readregisters(214) --log('Read inputs',read_inputs,err) read_alarm,err= mb:readregisters(500) --log('Read alarms',read_alarm,err) if control_motor then   if motor_on then     if read_mode ~= 75 then       res,err = mb:writeregisters(8,2)       --log('Write_motor_to_on',res,err)     end     if read_speed ~=hz_sp then       res,err =mb:writeregisters(13,hz_sp)       --log('Write_motor speed',res,err)     end   else     if read_mode ~= 0 then       res,err = mb:writeregisters(8,0)       --log('Write motor off',res,err)     end   end end if reset_command then   --log('Reseting frequency converter')   log(mb:writeregisters(1,1))   grp.checkupdate('34/1/4', 0) end mb:close() if read_mode == 75 or read_mode == 67 then   grp.update('34/1/3', read_speed/50) elseif read_mode == 0 then   grp.update('34/1/3', 0) end

I have seen this kind of problem with some other devices as well (chiller cooling units and swegon ventilation unit).

[Daniel]

Try adding mb:flush() after setslave.
Why don't you use profile?

[fleeceable]

Thanks!
Gonna try that.

One reason is that I like coding and I usually have custom projects where modbus part is custom every time.
To create profile and test it is quite time consuming compared with coding.