Sensor Technology and Application Basics
Outputs & Wiring
WIRING
Connecting Relay Outputs in Series or Parallel
To simplify the wiring of relay outputs it helps to separate the output wiring from that of the power wiring. In either configuration, you will run the power wires in parallel, you are then free to connect the outputs in the configuration desired.
Series connection of relay outputs
Parallel connection of relay outputs
Connecting 3- Wire Outputs in Parallel
Sensors with NPN or PNP transistor outputs are straightforward to wire in parallel. The low leakage current of transistor outputs allows a number of devices to be connected together before leakage current becomes a problem. Devices must all be of the same output configuration.
Parallel connection of 3- wire outputs
Connecting 3- Wire NPN Outputs in Series
Series connection of 3- wire NPN output devices requires each device in the series to supply negative to the next device with the last device in the chain supplying negative
to the load. Because each device supplies power to the next, response time is equal to the response time of the first sensor plus the sum of the turn on times of the others.
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