Hi Bachphi
We have been using varies Click PLCs for a number of years, they are 100% reliable now, the earlier firmware had a few odd issues with coding but I can't fault them now. We have a bottle filling machine that runs 6 days per week 52 weeks per year running 100,000 litres per day with a Click analog version with serial only comms, has never stopped, replaced the battery last year after 6 years of operation. Amazing little PLC.
Cheers Dale
Tasmania Australia