This topic describes limits that apply to edge instances and scene rules when you use Link IoT Edge.
Limits on edge instances
| Limit | Description |
| Maximum number of edge instances: 100,000 | You can use an Alibaba Cloud account to create a maximum of 100,000 edge instances. |
| Maximum number of users that you can authorize to access an edge instance: 20 | You can authorize a maximum number of 20 users to access each edge instance. |
| Number of gateways: 1 | Each edge instance has only one gateway. |
| Maximum number of drivers: 30 | You can add a maximum of 30 drivers to each edge instance. |
| Maximum number of sub-devices: 1,000 | You can add a maximum of 1,000 sub-devices to each edge instance. |
| Maximum number of scene rules: 30 | You can add a maximum of 30 scene rules to each edge instance. |
| Maximum number of Function Compute applications: 30 | You can add a maximum of 30 Function Compute-based applications to each edge instance. |
| Maximum number of message routes: 30 | You can add a maximum of 30 message routes to each edge instance. |
Limits on drivers
| Limit | Description |
| Maximum number of custom drivers: 50 | You can use an Alibaba Cloud account to create a maximum of 50 custom drivers. |
| Maximum size of a custom driver package: 50 MB | The maximum size of a custom driver package is 50 MB. |
| Maximum number of driver versions: 10 | Each driver can have a maximum of 10 versions. |
| Maximum number of key-value pairs: 100 | You can add a maximum of 100 key-value pairs to the configurations of a driver. |
| Maximum size of JSON data for a driver: 1 KB | Each driver contains up to 1 KB configuration data in the JSON format. |
| Maximum size of a configuration file for a driver: 1 MB. | The size of a configuration file that you can upload to configure a drive can be a maximum of 1 MB. |
| Maximum size of JSON data for a device: 1 KB | Each device contains a maximum of 1 KB configuration data in the JSON format. |
Limits on scene orchestration
| Limit | Description |
| Maximum number of scene rules: 100 | You can create a maximum of 100 scene rules in the Scene Orchestration section. |
| Maximum number of triggers: 10 | You can add a maximum of 10 triggers to each rule. |
| Maximum number of conditions: 5 | You can add a maximum of 5 conditions to each rule. |
| Maximum number of actions: 10 | You can add a maximum of 10 actions to each rule. |
Note If you want to increase one of the preceding limits, we recommend that you submit a ticket in the console for further assistance.