PLC类型：西门子cpu224xp 题目：霓虹灯广告屏装置的PLC系统设计 -the design for neon light with PLC(simens cpu 224xp and two EM222-8DO)

CPU224XP与禾川Sv-x3 PLS控制 SMB67:控制寄存器；SMW68:频率；SMD72:脉冲数；(CPU224XP and Sv-x3 PLS control SMB67: control register; SMW68: frequency; SMD72: pulse number;)