QnUDE(H)CPU Ethernet Loop Broadcast Storm Technical Bulletin

This technical bulletin describes how configuring a Built-in Ethernet port QCPU (QnUDE(H)CPU) network into a loop can cause a broadcast storm, leading to communication failure and a WDT error (error code 5001) that stops the programmable controller. It also details corrective actions (power cycle or reset) and notes that CPU modules with serial number "12052" or later include a function to limit scan time increases, preventing WDT errors during broadcast storms, and provides guidance on using special register SD1395 for monitoring.