![]() NPN Open Collector encoders “sink” current from sourcing (PNP) PLC inputs. Each output (A, B, Z) requires two wires, plus two wires for power supply (usually 5VDC).Ī second output type is an Open Collector (NPN transistor) (Image 4). 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. The same happens for the B and Z channels. The magnitude of the voltageĭifferential will be greater than 2.5V. When channel A is OFF, there’s a negative voltage differential between A and A. ![]() When channel A is ON there’s a positive voltage between A and A. Typical wire designations are A, A- (A “not”), B, B- (B “not”), etc. 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). Electrical output of incremenal encoders! Changchun Rongde Optics Co.,Ltd.
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