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1. How to transmit the signal of the flow meter to the PLC and display it on the computer screen without flow rate
Use AI module to collect the 4-20mA signal of the flow meter, program it for engineering quantification processing, display it and accumulate it; If the flowmeter has a communication function, it can directly read the flow rate using communication methods such as MODBUS, PROFIBUS, CAN, or free port communication; Some flow meters have pulse output function, so use the high-speed counter of PLC to collect pulses, and then program and process the displayed flow rate. If the PLC uses instantaneous flow to convert accumulated flow, usually a 4-20mA output is sufficient, and this frequency signal is usually used for accumulation. Moreover, the accuracy of the accumulated flow calculated by instantaneous flow conversion is much lower than that calculated by pulse counting. The implementation of PLC accumulation is also very simple. For analog quantities, there is an instantaneous value at a certain moment, as long as the instantaneous value is read every second for accumulation. Pulse switching is simpler, and the flow value represented by each pulse can be set in the flow meter. Once determined, the PLC can directly read the number of pulses to calculate the flow value and cumulative value. Extended information: After the programmable logic controller is put into operation, its working process is generally divided into three stages, namely input sampling, user program execution, and output refresh. Completing the above three stages of key leasing is called a scanning cycle. During the entire runtime, the CPU of the programmable logic controller repeatedly executes the above three stages at a certain sc
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2. Types and principles of flow meters
1. Classification of flow meters according to measurement principles: mechanical principles, thermal principles, acoustic principles, electrical principles, optical principles, atomic physics principles, etc. According to the structural principle of flow meters, they can be classified into volumetric flow meters, differential pressure flow meters, float flow meters, turbine flow meters, electromagnetic flow meters, vortex flow meters in fluid oscillation flow meters, mass flow meters and insertion flow meters, and probe flow meters. 2、 The working principle and application of commonly used flow meters: 1. Differential pressure flow meter Differential pressure flow meter is an instrument that calculates flow based on the differential pressure generated by the flow detection component installed in the pipeline, known fluid conditions, and the combined size of the detection component and the pipeline. Application: Differential pressure flowmeter has a wide range of applications,
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