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PPI是点到点的主从协议, PLC的通讯接口缺省情况下工作在PPI从(slave)模式,以便接收来自Step7 MicroWin编程软件的数据,Step7 MicroWin自然工作在PPI主(master)模式。ESM6802在与PLC相连时,ESM6802作为上位机工作在主模式,PLC通讯接口为缺省的从模式。
PPI is a point-to-point master-slave protocol. The communication interface of PLC works in PPI slave mode by default to receive data from STEP7 microwin programming software. STEP7 microwin naturally works in PPI master mode. When esm6802 is connected with PLC, esm6802 works in the master mode as the upper computer, and the PLC communication interface is the default slave mode.