Incremental encoders offer several types kinds of electrical outputs: Line Driver, NPN Open Collector, or Push-Pull (Totem Pole).A Line Driver output is a differential signal and requires two unique output wires per channel (Image 3). Typical wire designations are A, A- (A ¡°not¡±), B, B- (B ¡°not¡±), etc. When channel A is ON there¡¯s a positive voltage between A and A-. When channel A is OFF, there¡¯s a negative voltage differential between A and A-. The magnitude of the voltage
differential will be greater than 2.5V. The same happens for the B and Z channels. Line Drive outputs provide a high quality signal and are fairly immune to electrical noise.Line Driver encoders are very straightforward to wire to line driver-equipped PLC or motion controller inputs. Each output (A, B, Z) requires two wires, plus two wires for power supply (usually 5VDC).
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