【摘要】 介绍PPI的通讯方式,并在由三台S7-200的PLC组成其中有两台为主PLC的PPI系统中测试令牌的传递方式。同时分析了冷库温度控制的要求,介绍以两台主S7-200组成的多主PPI网络来控制冷库温度的应用。更多还原

【Abstract】 This text introduces the communication way of PPI. And in a system of three S7-200 PLCs among them two PLCs is initiative we test the transformation of Token-Ring. Analysing request of the temperature of the cooled store ,introducing application of PPI communication system which consists of two sets of S7-200 PLC in cooled storage temperature control.更多还原