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(上接2006年第5期第42页)监控系统的主站和从站PLC都选用Siemens的Simatic S7-300系列的产品。该产品在工程领域应用广泛,尤其是有较强的组网能力。现场设备层的主要功能是连接现场设备,如浊度检测仪,余氯检测仪等,完成现场设备控制及设备间连锁控制。主站(二万吨滤池PLC)负责
(Continued on page 5 2006 page 42) monitoring system of the master and slave PLC are selected Siemens Simatic S7-300 series of products. The product is widely used in engineering, especially with strong networking capabilities. The main function of the field device layer is to connect on-site equipment, such as turbidity detector, residual chlorine detector, etc., to complete on-site equipment control and equipment chain control. The main station (20,000 tons filter PLC) is responsible for