Design and Implementation of the Automatic Control System of Water Treatment

The design and application of the automatic control system for the ORBAL technics water treatment is introduced. This system includes upside computers, downside PLCs and remote I/O workstations. The technics flow, the compose of the 3-class DCS are introduced in details. Specially, the communication between upside computers and downside PLCs,VB programme for DDE link, the connection of remote I/O workstations and PLCs through genius bus, the hot backup redundancy are implemented. Practical results show that the design structure is good, the running is reliable and the requirement is satisfied.