Flow logic

Flow is the graphical editor you use to create ILEVIA server logic without writing code: you place nodes on a workspace and connect them with wires. Each node does one thing only (an AND gate, a timer, a comparison, a counter…) and the wire carries the value from one node’s output to the next node’s input. The result is a chain that starts from plant components (pushbuttons, sensors, KNX values) and reaches other components (lights, valves, notifications).

Requirements

• An ILEVIA server with the Logic module installed and running: it is the Logic module that executes flows on the server.

• ilevia Manager with the plant project and an up-to-date browser (Chrome, Edge, Safari, or Firefox).

• An Internet connection on the computer you are working from: the editor is a web app at flow.ilevia.com.

Opening the Flow editor

The editor is opened from the administrator user settings in ilevia Manager:

1. open the project and choose Users > Edit user on the administrator user (the first user in the project);

2. in the Web app row, find the Open flow group;

3. press Open flow to open the editor in a Manager window, or the globe icon (Open in browser) to open it in the browser, or the copy icon (Copy link) to copy the link.

The link contains the user QR code (https://flow.ilevia.com/?qr=…): this is how the editor connects to your plant and shows its components. Treat this link like a password and do not share it.

Basic concepts

Each input and each output has a type, shown next to the name in the Properties panel:

• Boolean: on/off, true/false (1/0);

• Number: a number, with or without decimals (temperatures, percentages, levels);

• String: text;

• Color: a color in hexadecimal format (#FF0000);

• Select: a choice from a list (for example the condition of an IF).

When a value reaches an input of a different type, the server converts it: for example, the text "1" becomes true on a Boolean input, and the number 22.5 becomes the text "22.5" on a String input.

The sample project

For each node in these guides, there is a ready-to-open sample flow. Download the project and open it in the editor with the Open File button (the second icon at the top left): you will find 33 flows, one per function, plus three complete examples.

The examples use only Dummy, Variables, and KNX nodes: they can be opened in any plant without affecting the existing components. To use them for real, replace the Dummies with the components of your plant (see Components and Dummy).

The guides