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Hello, new here but i have experience programming unitronics PLCs. A year ago i program one Vision 700 PLC for an oven. The program manage the oven and record temperatures. When the process ends. PLC send an email with the recordings. After three months with daily use the PLC stop working correctly. The user cant change the variables throught HMI. When touch the Variable box in HMI to change it nothing happened. The touch screen worked fine and user can touch other HMI Buttons but not Variables. What i did was zero all the PLC operants to default. Then everything works fine.Aft