The Design Of Field Bus Sewage Processing Control System Using PLC

The paper has first studied earth east banner sewage factory existing CASS (cyclic activated sludge system) the sewage treatment craft characteristic, unifies the scene equipment the request, the build simulation system, realizes to the key link control confirmation.Chooses Simens S7-300 series PLC to take the system central processor, uses the PROFIBUS-DP field bus to constitute the distributional control system, has set up the correspondence network, connects each kind of different factory the equipment, gathers the scene signal, the output control command.The paper has completed the system software design, realizes semiautomatically to the sewage treatment craft, the completely automatic monitoring.Finally passes through under the laboratory condition to confirm, system normal operation.The paper has mainly completed following work:1. constructs the communications network.West of family household S7-300 is the central controller between, designs the PROFIBUS-DP field bus to complete the master control regulator and disinfection workshop S7-200, the sludge dewatenng the far period of time stands with the air blower far period of time stands the communication.2. completes the control system the software design. Uses the trapezoidal chart programming language, the compilation, the debugging, completes the PROFIBUS -DP signal procedure and the scene equipment semiautomatic, the completely automatic control, meets the scene control requirements.3. on position machine design monitor routine 6.2 configuration softwares for develop the platform with Simens the WINCC, causes to monitor the software to have the real-time management, the monitoring, reports to the police and so on the functions.Has confirmed the system normal operation after the laboratory condition under.