Datasheet W181A-P504 · Four volt-free contacts reported via Wi-Fi (fault, door, level), with OLED display

W181 module in compact DIN rail enclosure, front three-quarter view: OLED display, three push buttons, DIP switch, USB-C port and screw terminals

The W181A-P504 has four isolated inputs for volt-free contacts and sends every change via Wi-Fi using the MQTT protocol to a server (broker). This way you are notified when an installation goes into fault, a door opens or a level switch responds. The Wi-Fi network and the server are set up through the built-in hotspot; the OLED display shows the state of the contacts and the connection status.

Price on request. Supplied in series, from 10 units per item. Not in stock? Then we build your series. One or a few units only as a trial, for a company with a series in sight.

Specifications

Supply	24 V DC (±15 %)
Input	Four inputs for volt-free contacts
Output	Wi-Fi with MQTT to a server of your choice; message on every change
Isolation	Inputs galvanically isolated with optocouplers
Setup	OLED display with UP, DOWN and OK buttons; DIP switch for basic choices
Communication	Wi-Fi network and server set through the built-in hotspot
USB	USB-C for software updates and reading the status
Wi-Fi	Built-in hotspot for software updates
Mounting	DIN rail, compact enclosure
Internally fitted with	PR181s04

Setup

Connect the supply, the four contacts according to the wiring diagram supplied with the module.
Switch on the Wi-Fi hotspot on the display, connect with a phone or laptop and enter your Wi-Fi network and the MQTT server details.
Operate each contact once and check that the message arrives in your dashboard.