Allen Bradley 20-750-ENC-1 PowerFlex 750 Single Incremental Encoder Module, Differential or Single Ended operation, Constant Current Sink operation, approx 10 mA; Input: 5V DC min to 15V DC max sourcing 10 mA; Minimum high state voltage of 3.5V DC; Maximum low state voltage of 0.4V DC, Maximum Cable Length: 30 m (100 ft) at 5V, 183 m (600 ft) at 12V, Series A