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Flow meter programming

『Flow meter programming』Related information(clamp on meter|electromagnetic meter|venturi meterrotameter|orifice meter|ultrasonic flow meter|mass flow meter|coriolis mass flow meter|coriolis flow meter|magnetic flow meter|magmeter flow meter|magflow flow meter|mag meter flow meter|electromagnetic flow meter|vortex flow meter|turbine flow meter|thermal mass flow meter|thermal flow meter|rotameter flow meter)

1. Program pLC Siemens S7-200 and flow meter. Flow meter 4-20mA analog signal

For example, using a 0-20mA analog signal input, within the S7-200 CPU, 0-20mA corresponds to a numerical range of 0-32000 for dispersion and dispersion; For a signal of 4-20mA, the corresponding internal value is 6400-32000, which means that; The number read by PIW256 corresponds to 6400-32000, and any value greater than 32000 or less than 6400 is incorrect. Assuming the range of the flowmeter is 0-300, corresponding to PIW256s 6400-32000, assuming that the standard electrical impulse signal of the analog quantity is A0 Am (such as 4-20mA), and the value after A/D conversion is D0-Dm (such as 6400-32000), assuming that the standard electrical signal of the analog quantity is A and the corresponding value after A/D conversion is D, due to the linear relationship, the functional relationship A=f (D) can be expressed as a mathematical equation: A=(D-D0) × (Am-A0) modified rubber/(Dm-D0)+A0.

2. How to transmit the signal of the flow meter to the PLC and display it on the computer screen without flow rate

Use an 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 ac
Flow meter programming
cumulation. 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 scanning speed. In the input sampling stage, the programmable logic controller sequentially reads in all input states and data in a scanning manner, and stores them in the corresponding units in the I/O mapping area. After the input sampling is completed, it enters the user program execution and output refresh phase. In these two stages, even if the input state and data change, the state and data of the corresponding unit in the I/O mapping area will not change. Therefore, if the input is a pulse signal, the width of the pulse signal must be greater than one scanning period to ensure that the input can be read in under any circumstances. Reference source: Baidu Baike - Programmable Logic Controller

3. Smart200 PLC flowmeter npn sens

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