# Create an interface
<a name="interface-create"></a>

You can create interfaces using either the AWS IoT SiteWise console or the AWS CLI.

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#### [ Console ]

1. Navigate to the [AWS IoT SiteWise console](https://console.aws.amazon.com/iotsitewise/) and choose **Models** from the navigation pane.

1. Choose **Create interface**.

1. Enter a unique **Name** and optional **Description** for your interface. You can also optionally add an **External ID** of you choosing.

1. Add properties to your interface. You can add attributes, measurements, transforms, and metrics just like with asset models. For more information, see [Create an asset model (console)](create-asset-models.md#create-asset-model-console).

1. Choose **Create interface** to create the interface.

1. If you have hierarchies to define parent-child relationships between interfaces, choose **Add hierarchy** and enter relevant details.

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#### [ AWS CLI ]

To create an interface, use the `CreateAssetModel` operation with the `assetModelType` parameter set to `INTERFACE`:

```
aws iotsitewise create-asset-model \
  --asset-model-name "CNC-INTERFACE" \
  --asset-model-description "Standard interface for CNC machines" \
  --asset-model-type "INTERFACE" \
  --asset-model-properties '[
    {
      "name": "Temperature-in-C",
      "dataType": "DOUBLE",
      "type": {
        "measurement": {}
      },
      "unit": "Celsius"
    },
    {
      "name": "Down-time",
      "dataType": "DOUBLE",
      "type": {
        "measurement": {}
      },
      "unit": "Minutes"
    },
    {
      "name": "Running-time",
      "dataType": "DOUBLE",
      "type": {
        "measurement": {}
      },
      "unit": "Minutes"
    },
    {
      "name": "Availability",
      "dataType": "DOUBLE",
      "type": {
        "metric": {
          "expression": "Running-time / (Running-time + Down-time) * 100",
          "variables": [
            {
              "name": "Running-time",
              "value": {
                "propertyId": "${Running-time}"
              }
            },
            {
              "name": "Down-time",
              "value": {
                "propertyId": "${Down-time}"
              }
            }
          ],
          "window": {
            "tumbling": {
              "interval": "1h"
            }
          }
        }
      },
      "unit": "Percent"
    }
  ]'
```

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