描述
液压站共由8只电磁阀控制，8只电磁阀的供电是直流24V，8只电磁阀由PLC据工艺流程实施自动控制。两名实习生围着液压系统和PLC电控柜来回转了几圈，测了一下电磁阀（标号为8YV）线圈有正常的电阻阻，大概几十Ω，判断电磁阀是好的，请操作工人操作了一回电控柜，其它七只电磁阀都能正常动作。但8YV线圈两端总是得不到电压，不能吸合。两名实习学生大致检查了一下线路，由PLC的输出触点驱动中间继电器KA8，由KA8再控制电磁阀的动作
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