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+--- Thread: troubleshooting modbus script to control fornius inverter (/showthread.php?tid=5351)
troubleshooting modbus script to control fornius inverter - cgn - 09.04.2024
Hello,
due to dynamic energy prices I wan't to enable / disable throttle of the inverter. This is possbile via modbus. Unfortunatelly it's not working and I have nothing in the log of LM.
Code:
require('luamodbus')
mb = luamodbus.tcp()
mb:open('192.168.1.111', 502)
mb:connect()
res, err = mb:connect()
if res then
if (value <35) then
r0 = mb:writeregisters(40236, 0)
log(r0, '<')
else
r1 = mb:writeregisters(40236, 0)
r2 = mb:writeregisters(40232, 10000)
r3 = mb:writeregisters(40236, 1)
log(r1, r2, r3 '>')
mb:close()
end
else
log('failed', err)
endLog if value <35
* arg: 1
* nil
* arg: 2
* string: <
=> This seems to work
Log if value >35
Nothing in the log and I don't know why.
Any idea what could be wrong?
RE: troubleshooting modbus script to control fornius inverter - admin - 10.04.2024
You have two connect calls, remove one of them. Then log the error returned by the write call:
Code:
r0, err = mb:writeregisters(40236, 0)
log(r0, err)Same for all other registers.
RE: troubleshooting modbus script to control fornius inverter - cgn - 15.04.2024
Thanks, that was an error as well. If someone what's to set the softlimit from a fronius inverter depending on the enery prices, this is the clean code:
Code:
t = os.date ("*t")
value = grp.getvalue('34/1/' .. t.hour)
require('luamodbus')
mb = luamodbus.tcp()
mb:open('192.168.1.111', 502)
res, err = mb:connect()
mb:setslave(1)
if res then
if (value <35) then
mb:writeregisters(40236, 0)
log('PV softlimit')
else
mb:writeregisters(40236, 0)
mb:writeregisters(40232, 10000)
mb:writeregisters(40236, 1)
log('PV unlimited')
end
mb:close()
else
log('failed', err)
end