In a system debugging process, the MCU cannot startup normally.
Set the default IP address (SW2 set as ON). The MCU cannot startup normally. The alarm indicator blinks fast after 5 minutes later.
The alarm indicator fast blink means the CPU1 work abnormal. Start system, and track this process. The CPU1 is not started. Check the configuration, and we find the gateway is set as 255.255.252.0, which leads the abnormal start of CPU1. Then the communications channel cannot be establish because of CPU1 abnormal start, which leads system work abnormally.
The gateway will be set as 0.0.0.0 if there is no gateway in network.