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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. Flow meter with five front and three back, in front of the five finger arrow or behind the arrow?
The first five and the last three refer to the straight pipe section distance of 3 or 5 times the diameter (unit) in front or behind the rock search surface where the pipeline is opened. For example, if the flow meter is DN100, there should be a 5 * 100mm straight pipe section at the front and a 3 * 100mm straight pipe section at the back to ensure proper distance. The calculation method refers to Wang Shens figure below:
3. Difference between flow meter per minute and per hour
The difference between flow meter per minute and per hour is as follows:
1. Different meanings: Flow rate per minute refers to the volume of liquid or gas passing through the flow meter in each minute, while flow rate per hour refers to the volume of liquid or gas passing through the flow meter in each hour.
2、 Different application scenarios: Minute traffic is suitable for applications that require real-time monit
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