The acoustic signal on the erector is activated, when bracing active is and　the minimum pressure is not reached.
A "M 120.5" M120.5 CLOSE ERECTOR CLAW
AN ".16/27.5" I44.2 连接液压系统压力继电器
A "Takt_2Hz" M1.3 clock frequency 2 hertz
O ".9/22.2" I16.1 检测按扭
= ".16/10.2" Q25.2　　喇叭响
这些是程序说明和具体程序，帮忙解释解释．．一起研究一下．．．