Supervisory System Of Remote & Multi-PLC

In the paper,we developed a supervisory system of Remote & Multi-PLC,based on the demand of the practical engineering and the feature of the monitoring system on the sewage pumping station. And,to accomplish the immediate & free access to the multi-PLC,we take database & COM of Visual Basic 6.0 as the core technique,and employed the flexible hierarchical structure. Therefore the report can satisfy all the user's demand to a distributed unmanned system. So,We have made an in-depth research about the communication and the unmanned control in the local controlling.