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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
2. What are the 5 lines of the air flow meter?
The five wires of the air flow meter: two are intake temperature wires: one is a live wire, one is a signal wire, and the other three are a live wire, one is a ground wire, and one is a signal wire.. An air flow meter is a device that converts the amount of air drawn in into an electrical signal. The advantages of an air flow meter are minimal pressure loss and a wide range of measurable flow rates. The ratio of the maximum flow rate to the minimum flow rate of an air flow meter is generally above 20:1, and it is suitable for a wide range of industrial pipe diameters, up to 3m. The output signal is linear with the measured flow rate, with high accuracy, and can measure the fluid flow rate of acid, alkali, salt solutions, water, sewage, corrosive liquids, as well as mud and slurry with conductivity ≥ 1 μ s/cm. But air flow meters cannot measure the flow of gas, steam, and purified water. Additional information: Classification of principles of air flow meters Blade
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