HART device inventory

The inventory process is conducted when the connector initially connects to the device, after a communication failure with the device, and after detecting a configuration change on the device.

During the inventory process, PI Connector for HART-IP issues the following commands:

1. Command 0 request to read the identity information about the field device including the device type, revision levels, and device ID.

2. Command 13 request to read the device tag descriptor.

3. Command 20 request to read the long tag name.

4. Command 50 request to read the dynamic variable assignments.

5. Command 9, or Command 3 for a HART 5/6 device, requests to read device variable data.

   A separate Command 9, or Command 3 for a HART 5/6 device, request is issued for each device variable on the device. The number of device variables found on a device is determined by the maximum number of device variable values returned in the Command 0 response.

6. Command 105 request to read burst mode configuration.

   Note: All sub-device commands listed above for the inventory process and real-time data collection are embedded in Command 77 (Send Command to Sub-Device) to retrieve data from connected sub-devices.

If the connected HART-IP device is a gateway, the connector issues the following commands:

7. Command 74 to read the gateway I/O system capabilities.

8. Command 84 to read sub-device identity.

   A separate Command 84 is issued for each sub-device, followed by commands in the previous list to obtain sub-device inventories.