How to transmit the signal of the flowmeter to the PLC, and then display it on the computer screen w

The AI module is used to collect the 4 20mA signal of the flowmeter, which is programmed for engineering quantification and then displayed and accumulated; If the flowmeter has a communication function, it can use communication such as Modbus, Profibus, CAN and other buses or free port communication to directly read the flow rate; Some flowmeters have a pulse output function, so the high-speed counter of the PLC is used to collect the pulses, and then the flow rate is programmed to be displayed.

If the PLC uses the instantaneous flow rate to convert the cumulative flow, there is generally a 4-20mA output, and this frequency signal is generally used for accumulation. Moreover, the cumulative flow accuracy of instantaneous flow conversion is much lower than that calculated by pulse counting.

The PLC cumulative implementation is also simple for analogues.

There is an instantaneous value at a certain time, as long as the instantaneous value is read every second for accumulation. The pulse switching amount is simpler, the flow value represented by each pulse can be set in the flow meter, and after it is determined, the PLC can directly read the number of pulses to calculate the flow value and cumulative value.

Step 7 of the configuration software used by the S7-300 is configured first.

Then find a configuration software to communicate with the S7-300, and now the most common is the configuration king. WinCC or you want to use a high-level language to do the communication with the S7-300 (you can query the concept of OPC), since you have chosen the S7-300, then the concept of distributed network must be understood.

Calm down. There are a lot of answers online.

Is your flow meter outputting a pulse or a 4-20mA signal? Whether it's a signal, you look at the terminal block on your PLC and then determine how to wire, as for the display of traffic on the computer, you can connect the communication cable from the PLC to the computer, and install a receiving software on the computer. As for how to wire and how to install the software, it depends on your PLC

Make sure what kind of output signal your flow meter is! If it is an analog signal, then you can read the signal to the PLC through the AD module, and then go through your calculations!

What signal does the flow meter transmit? 4-20ma？You can first use a multimeter to test the PLC terminal to see if the signal has come.

According to the signal, it is judged whether it is a flowmeter problem or a PLC problem. Usually it is no problem for the flow meter to have a display on the head of the flow meter. The configuration of the PLC can be checked.

You need to use the AD module, which is the analog-to-digital conversion module, and then set the register address in the module to store the analog quantity, so that you can contact the touch screen.

The first thing you have to solve is how to transmit the collected signal to the PLC, first of all, you can use the data acquisition card, such as the three-grid electronic one, as shown in the figure: he can realize the analog voltage or current signal through conversion in the form of 232 or 485 serial port, if you use the PLC communication mode is also a serial port, then use this converter to solve, if it is an Ethernet port, then add a gateway on it, <>