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Lead Contents

Proximity Sensors: Connection Switch of F92A Inductive Couplers

FAQ No. FAQ02666

Primary Contents

Question

Can General-purpose Proximity Sensors be used as the connection switch of F92A Inductive Couplers?

Answer

Yes, it can be used if the output circuit of Sensors are an open collector.

1.NPN Open Collector

Connect Sensors output terminal and the negative terminal to the switch connection terminals of F92A.

2.PNP Open Collector

Connect Sensors output terminal and the positive terminal to the switch connection terminals of F92A.

In this case, however, the transmission distance will be approximately half the distance when a contact switch is used.

If contacts are used for the connection switch, current to F92A will flow in both directions, as shown by the arrows in Figure 1. If a Sensor with an open-collector output is used, current will flow to F92A in one direction, as shown in Figure 2, and so the change in impedance input to Proximity Sensors will be reduced by half. To obtain the same change in impedance as when using a contact switch, the transmission distance between Proximity Sensors and F92A will need to be reduced by half.

Figure 1

Figure 2