功能 #2695
软件中需要周期性识别主电源（Input Channel2）是否存在，若丢失主电源(Input channel 2 = LOW)，且此时Input Channel2）是否存在，若丢失主电源，且此时Input Channel1和Input Channel3任一个存在，或同时存在，则进入BCM failsafe mode。 (The software needs to periodically identify whether the main power supply (Input Channel2) exists. If the main power supply is lost and either Input Channel1 or Input Channel3 exists separately or at the same time, enter the BCM failsafe mode.)