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Puppy error

#31512 (CORE One)

Relevant for

CORE One
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What happened? 

On the Prusa CORE One, communication with the xBuddy extension board is achieved using the MODBUS protocol. In MODBUS, there are two types of devices: the master and the slave, also known, respectively, as client and server. On Prusa CORE One firmware, the master is the xBuddy, and each slave is called puppy

To be able to establish communication with the puppies, each puppy is assigned a unique address that is used by the xBuddy. If the xBuddy finds a puppy without an assigned address, the printer will show the message: "Unassigned puppy found".

Error name: Puppy no addr

Error code: #31512

The error indicates most likely a configuration problem that might have stemmed from the firmware, or a faulty connection of the xBuddy extension board. 

How to fix it? 

Ensure the printer is cold, switched off, and disconnected from the mains before accessing its electronics. 

Access the xBuddy and xBuddy extension boards by loosening six M3x4bT bolts to remove the cover. Once visible, check the boards for visible damage on their surface, and check the connection between xBuddy and xBuddy extension for any irregularities.