Duplicate Device ID

Overview

• More than one device on the same BACnet Network with the same BACnet Device Instance (aka Device ID).
• Does not distinguish between different UDP ports, so if they are on different ports, it could be a false fail (have to drill down into frame info).
• Still recommended to give them all unique IDs in case you need to change your applications or reconfigure the site in the future.

Why it fails

• Bad address mapping and planning.
• DIP switch on the controller.
• Software addressing.
• Merging networks (BBMD, etc.).
• Adding controllers from other vendors.
• Factory defaults.

How to fix it

• Look at the Device ID that is duplicated, and at how many there are.
• Drill down, and cross-reference the SNET and SADR with your device map to identify which devices are duplicated.
• Ensure you have a clear Device ID naming convention and map.
• Fix them: Give one a different address or put it offline so you can identify it, then start re-commissioning.