after writing formula, input device(modbus) serial status undefined

[afzal]

Hi,

i am getting data from modbus.
i have created 10 input channels to read the temp.
i create another channel to read the sum of channel 101 and 102 using the formnula val(101)+val(102).
in this case channel 110 should read the sum, but as i upload the configuration,
modbus status become undefined and i do not get any data.
what could be the problem ?

Thanks

[Mikhail]

Hi,

Please provide screenshots.

[Author]

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