1756-IF16A | ALLEN BRADLEY | DC input circuit MODULE

Description

1756-IF16A | ALLEN BRADLEY | DC input circuit MODULE

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A form of 1756-IF16A input circuit (drawing only one input circuit). When the switch of the external circuit in Figure 1 is closed, the light-emitting diode of the internal optocoupler of the PLC lights up, the photosensitive transistor saturates and conducts, and this conduction signal is then transmitted to the processor, so that the 1756-IF16A believes that there is a signal input in the circuit; When the external switch is disconnected, the light-emitting diode in the optocoupler goes out, the photosensitive transistor cuts off, and the CPU believes that there is no signal in this circuit.
The AC input circuit is shown in Figure 3, and it can be seen that the difference between it and the DC input circuit is mainly
It means adding a rectification link.

The input voltage for 1756-IF16A input is generally AC120V or 230V. AC power is limited by a resistor R and isolated by a capacitor C (removing the DC component from the power supply), and then rectified by a bridge to form DC power. Its working principle is the same as that of a DC input circuit, and will not be further elaborated.

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