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Analog input module - AI 4 x I, 0/4-20 mA, ±20 mA, 12 Bit Characteristics 4 analog inputs for measuring current, electrically isolated from the backplane bus 4 process input words Measuring ranges: 0-20 mA, 4-20 mA, ±20 mA, individually configurable for each channel Measurement resolution: 12 bits + sign Diagnostic messages Wire break detection (for 4-20 mA) Limit value alarms for each channel A bi-color LED (blue/red) indicates the modules operating status and any malfunctions Parameters for the module Diagnostic alarm: On | Off Overflow / underflow diagnosis: On | Off Representation values: SIMATIC* S7 | SIMATIC* S5 Parameters for each channel Wire break detection (for 4-20 mA only): On | Off Interference frequency suppression: None | 10 Hz | 50 Hz | 60 Hz | 400 Hz Measuring ranges: Disabled | 0-20 mA | 4-20 mA | ±20 mA Limit value alarms enabled: On | Off Upper/lower limit: 16-bit analog value (±27648) |