The controlling trapezia is finished by extension of former PLC, applying the soft ware of HITACHI PLC to control the inverter correspondingly, and structure process design.

• 经过对原系统的PLC进行扩展，并应用日立PLC相关软件对变频器进行了通讯控制，应用结构化程序设计，编制出控制梯形图，成功地对堆垛机提升电机进行变频调速控制。