Calculated output for flare valve :- MD204.Calculated output for compressor valve :- MD790. Flare control valve analog output :- QW98 M memory.Compressor control valve analog output :- QW96.Analog input from PT :- IW64 Outputs List.Hence you can calculate output range in PLC. PLC uses SPLIT programming so you can connect two control valves with separate analog output. When controller output is 100% both the outputs are fully open. If the pressure still increases flare valve starts to open to evacuate the gas and burn it. When pressure increases, the control valve allow product to exit and compressor valve continues to open until controller output reaches 50%. If the pressure is low, the PID controller output is 0% output and both valves are closed and it will allow pressure to build up in the vessel. We use an PID controller in PLC for controlling of two valves as per requirements. Pressure transmitter is used for pressure control in a vessel. Two control valves are used for controlling, one is for compressor and other is for flare. Here we are discussing about flare control example. For this application, we will use sequence control concept.
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