B&R PLCs Troubleshooting & Procedures

Step-by-step procedures

• B&R X20 — CPU STOP/RESET & X2X Bus Faults — A B&R X20 CPU that leaves its I/O dead is usually not in RUN — the X2X bus only runs when the CPU does. Learn to read the status LEDs, tell normal boot blinking from a fault, pull the real error from the Automation Studio Logger, and power-cycle correctly.