Explanation for the PLC controller input and output line has up to now been given only theoretically. In order to apply this knowledge, we need to make it a little more specific. Example can be connection of external device such as proximity sensor. Sensor outputs can be different depending on a sensor itself and also on a particular application.
![](https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEgDG22RxVG7C1v-EAL55HNs7eVZIvgt6cflQ9sXYv9fghQpKn2OP_7oG_V-VlmoTNfhLjqlYfLOMU1Wt4gk8Ek0Coo1qVW_vztiqR_U0-scOeCbXD2sMdf4od5xYES8JuaSMRu19r7AwA/s320/Input+Lines1.jpg)
This pictures display some examples of sensor outputs and their connection with a PLC controller. Sensor output actually marks the size of a signal given by a sensor at its output when this sensor is active. In one case this is +V (supply voltage, usually 12 or 24V) and in other case a GND (0V). Another thing worth mentioning is that sinking-sourcing and sourcing - sinking pairing is always used, and not sourcing-sourcing or sinking-sinking pairing.
![](https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEggq4VQCFoJExS70WQ-C0NDAGp4LrTd2aO9eierLvKhCiQfL39DpVSG_f0nOP5CWwngqT5kqKH3GHZIyE0UHJ6VLeelXng7ZGgLAOjxJviV0V8MfKSAw4IF5mfQUca8hde2fd5tMoQ6PQ/s320/Input+Lines2.jpg)
![](https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEipFrw5jE5RRRJTuN-bl9MY7J41mPNLVmOYSgWsGyk-HmB6J2lzQq36BM3M7AZa8HYAWZ0_OU0ZKknUT23Ko7t9XBDSHZB2MIRMO3rNBizg2ZUsFLvR1hibhaB92cGo1XYZ1j_e4lEzpg/s320/Input+Lines3.jpg)
If we were to make type of connection more specific, we'd get combinations as in following pictures (for more specific connection schemas we need to know the exact sensor model and a PLC controller model).
![](https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEgDG22RxVG7C1v-EAL55HNs7eVZIvgt6cflQ9sXYv9fghQpKn2OP_7oG_V-VlmoTNfhLjqlYfLOMU1Wt4gk8Ek0Coo1qVW_vztiqR_U0-scOeCbXD2sMdf4od5xYES8JuaSMRu19r7AwA/s320/Input+Lines1.jpg)
This pictures display some examples of sensor outputs and their connection with a PLC controller. Sensor output actually marks the size of a signal given by a sensor at its output when this sensor is active. In one case this is +V (supply voltage, usually 12 or 24V) and in other case a GND (0V). Another thing worth mentioning is that sinking-sourcing and sourcing - sinking pairing is always used, and not sourcing-sourcing or sinking-sinking pairing.
![](https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEggq4VQCFoJExS70WQ-C0NDAGp4LrTd2aO9eierLvKhCiQfL39DpVSG_f0nOP5CWwngqT5kqKH3GHZIyE0UHJ6VLeelXng7ZGgLAOjxJviV0V8MfKSAw4IF5mfQUca8hde2fd5tMoQ6PQ/s320/Input+Lines2.jpg)
![](https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEipFrw5jE5RRRJTuN-bl9MY7J41mPNLVmOYSgWsGyk-HmB6J2lzQq36BM3M7AZa8HYAWZ0_OU0ZKknUT23Ko7t9XBDSHZB2MIRMO3rNBizg2ZUsFLvR1hibhaB92cGo1XYZ1j_e4lEzpg/s320/Input+Lines3.jpg)
If we were to make type of connection more specific, we'd get combinations as in following pictures (for more specific connection schemas we need to know the exact sensor model and a PLC controller model).
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