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# AWS::IoTEvents::AlarmModel Lambda
<a name="aws-properties-iotevents-alarmmodel-lambda"></a>

Calls a Lambda function, passing in information about the detector model instance and the event that triggered the action.

## Syntax
<a name="aws-properties-iotevents-alarmmodel-lambda-syntax"></a>

To declare this entity in your CloudFormation template, use the following syntax:

### JSON
<a name="aws-properties-iotevents-alarmmodel-lambda-syntax.json"></a>

```
{
  "[FunctionArn](#cfn-iotevents-alarmmodel-lambda-functionarn)" : String,
  "[Payload](#cfn-iotevents-alarmmodel-lambda-payload)" : Payload
}
```

### YAML
<a name="aws-properties-iotevents-alarmmodel-lambda-syntax.yaml"></a>

```
  [FunctionArn](#cfn-iotevents-alarmmodel-lambda-functionarn): String
  [Payload](#cfn-iotevents-alarmmodel-lambda-payload): 
    Payload
```

## Properties
<a name="aws-properties-iotevents-alarmmodel-lambda-properties"></a>

`FunctionArn`  <a name="cfn-iotevents-alarmmodel-lambda-functionarn"></a>
The ARN of the Lambda function that is executed.  
*Required*: Yes  
*Type*: String  
*Minimum*: `1`  
*Maximum*: `2048`  
*Update requires*: [No interruption](https://docs.aws.amazon.com/AWSCloudFormation/latest/UserGuide/using-cfn-updating-stacks-update-behaviors.html#update-no-interrupt)

`Payload`  <a name="cfn-iotevents-alarmmodel-lambda-payload"></a>
You can configure the action payload when you send a message to a Lambda function.  
*Required*: No  
*Type*: [Payload](aws-properties-iotevents-alarmmodel-payload.md)  
*Update requires*: [No interruption](https://docs.aws.amazon.com/AWSCloudFormation/latest/UserGuide/using-cfn-updating-stacks-update-behaviors.html#update-no-interrupt)