DP main station configure slave station, transfer PID parameter, control model select code. control measure preconcert value, locale parameter; DP主站软件用于组态从站、传递PID参数、控制模式选择码、控制量预定值、现场参数;
Send all non-transactional SELECTs to a slave 发送所有的非事务性SELECT到一个从数据库