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How is the ATV12 programmed for a 4-20mA analog input on AI1?
AI1 factory default is for a 0-5Vdc input.
Navigate to the AI1 Config menu using path ConF-FULL-IO-AI1-. Set AI1t = 0A. The input range is factory defaulted to 4-20mA, but can be changed with parameters CrL1 min and CrH1 max.