> For the complete documentation index, see [llms.txt](https://docs.enlyze.com/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.enlyze.com/en/connect/ot-connectivity.md).

# OT-Connectivity

In the following you will learn, how to connect to OT data sources using our connectors and make process data accessible within the ENLYZE Platform. We support a wide range of different industrial communication protocols to ensure full connectivity even in heterogeneous machine parks.

## Guides to connect to OT data sources

The connection process largely depends on the industrial communication protocol being used, which in turn is usually specified by the controller brand or the device to be connected.

Depending on the information available (machine manufacturer, controller brand, or industrial communication protocol), you can use the following documentation to check whether connectivity can be established and directly access the appropriate guide to correctly connect your data source.

#### [Connect by machine manufacturer](/en/connect/ot-connectivity/supported-machine-manufacturers.md)

#### [Connect by control brand](/en/connect/ot-connectivity/supported-controller-brands.md)

#### [Connect by industrial protocol](/en/connect/ot-connectivity/supported-industrial-protocols.md)

## Registering variables

The variables available on a data source are registered in the ENLYZE Manufacturing Data Platform in one of two ways, depending on the protocol used for the connection.

### Variable Discovery

Variable Discovery is an automated process in which an edge device assigned to the data source queries the variables available on the data source and registers them in the ENLYZE MDP.

**Applicable protocols:**

* S7+ (OMS+)
* PVI
* OPC-DA
* OPC-UA
* Beckhoff ADS

### Manual registration

If a data source is connected via a protocol that does not support Variable Discovery, the available variables are registered manually. This often requires additional resources such as data sheets or project files.

**Applicable protocols:**

* S7 (Step 7)
* Modbus