When doing a project on the CR0301 or CR0303 its important to use the CAN1_BAUDRATE function block along with the CAN1_EXT function block. The CAN1_EXT does set the baudrate but it only does it when the PLC_PRG is running. The can cause a problem on bootup with other devices on the bus. The CAN1_BAUDRATE sets the baudrate in the firmware after a power cycle it is then fixed at that baudrate.