s7-200PLC与变频器之间的MODBUS通讯减少了增加模块的经济费用-s7-200and v20

该文档为西门子200PLC系统使用手册，适合初学者了解200PLC硬件选型和注意事项。-This document is Siemens 200PLC system manual, suitable for beginners to understand 200PLC hardware selection and matters needing attention.