DI/en

General description

DI (digital input) — input with two states. Used to connect reed switches, water and electricity meters, buttons.

Discrete inputs are of two types:

1. Wet contact — input («Ax» at controller) with two states: «voltage applied» or «voltage not applied». To do this, one contact of the button / reed switch / counter is connected to a voltage source (for example, to the Vout terminal), and the other to DI.
2. Dry contact — input for connecting dry contact (W1, W2 at controller, WB-MR at relay modules, etc.), which check if they are shorted to ground.

One contact of the button / reed switch / counter is connected to the ground (to the GND terminal), and the other to the «dry contact» input. You can also connect outputs of the «open collector» type (connect grounds and input to output). Состояние входа:

• closed to ground - «on»
• not closed to ground - «off»

«Dry» are usually called contacts that are not connected to any other circuits of the external system: relay contacts, reed switches, switches. An “open collector” output, for example, cannot be called a dry contact, since it is not galvanically isolated from an external device.

Discrete inputs at the Wiren Board controller

As discrete inputs, you can use the universal inputs/outputs Ax (D1), which can operate as a discrete input in the voltage range up to 40 V. Signals from discrete inputs are displayed in the web interface of the controller or transmitted via MQTT.

• Универсальные входы-выходы
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  Wiren Board 6

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  Wiren Board 7

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  Schematic of the Ax

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  Schematic of the D1 in Wiren Board 7

When the channel is in input mode, the Ax_OUT (D1_OUT) switch must be turned off.