Digital design in digital output sensors

Digital output sensors, like other actuators driven by digital signals, are commonly used in a variety of industrial applications. We can easily find all kinds of sensors for digital output, including temperature, flow, pressure, speed, etc., which have digital signal outputs in various formats.

A digital sensor is a sensor that produces only a binary output. The digital output is only "0" or "1" compared to a continuously varying value within a range of analog output sensor outputs. The simplest example of a digital sensor is a contact switch. A typical contact switch is an open circuit with an infinite resistance that becomes a circuit with zero impedance when the switch is pressed.

1 dry node (on/off signal)

Dry Contact, also known as a dry contact, is a passive switch with two states of closure and disconnection. There is no polarity between the two nodes. exchange. Common dry node signals are:

1. Various switches such as: limit switch, travel switch, foot switch, rotary switch, temperature switch, liquid level switch, etc.;

2. Various buttons;

3. Outputs of various sensors, such as sensors in environmental power monitoring: water immersion sensors, fire alarm sensors, glass breakage, vibration, smoke and condensation sensors;

4. Relay, reed switch output.

2 wet node (voltage signal)

Wet Contact, also known as wet contact, is an active switch with two states of electricity and no electricity, and polarity between two contacts. Can not be reversed. In industrial control, the voltage range of the commonly used wet node is DC0~30V, the standard is DC24V, and the output of AC110~220V can also be wet node, but this is less. Common wet node signals are:

1. If the dry node signal is connected to the power supply and then to the other pole of the power supply, as the output, it is also the wet node signal;

2. The collector output and VCC of the NPN transistor;

3. The collector output of the Darlington tube and VCC;

4. The output of the infrared reflection sensor and the reflection sensor;

3 source input

The source input is used to connect the drain output device as shown in Figure 1.1.

Digital design in digital output sensors

Figure 1.1 Schematic diagram of source input

The drain output device provides a current-to-ground current path. The NPN open collector shown in Figure 1.2 is a typical drain output device. When the output low level is required, the triode is in a saturated state, which is equivalent to the output terminal being connected to the ground; when the output is high, the triode is in the off state, which is equivalent to the output terminal being disconnected from the ground (the output terminal is suspended).

Digital design in digital output sensors

Figure 1.2 Schematic diagram of the drain output

The source of the source input device (drain output) can only provide drive capability to ground.

4 sink input

The drain input is used to connect to the source-level output device, as shown in Figure 1.3.

Digital design in digital output sensors

Figure 1.3 Schematic diagram of the drain input

The source output device provides power or a positive voltage, equivalent to a switch connected to the power supply, as shown in Figure 1.4. When "Logic 1" is output, the switch is turned on.

Digital design in digital output sensors

Figure 1.4 Source output schematic

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