How to connect the pressure sensor to the plc'to realize the overweight alarm?
Wiring depends on the type of sensor you are, PLC module, model and so on.
First you have to use a A/D conversion module, and then connect to the PLC through the A/D module
1, from your point of view, you need to be measuring the weight of the object "weighing sensor" and "weighing transmitter"; that is, the media and the practical application in the measurement of pressure in closed systems (such as closed pipeline, the most common container medium pressure) is completely different. Although all the physical quantities are pressure, you should describe gravity exactly, and the sensors used are different.Pressure transmitter:Wiring diagram of process installation diagram of pressure transmitterCan be seen from the figure, the general use of 2 wire pressure transmitter, the DC24V power supply, the output is the standard 4~20mA analog signal, now all PLC are available through the standard analog acquisition module (A/D), collecting the signal directly. After the linear calibration of PLC software, the actual pressure value can be calculated: the engineering units are usually MPa, kg/cm2, bar and so on. Not only physical signals such as pressure, temperature and flow can be converted to 4~20mA standard analog signals through transmitters.2, the weighing sensor is different, it is a weight / quality into measurable electrical signal output device. The principle of sensor is divided into photoelectric type, electromagnetic type, capacitance type, magnetic pole form, vibration type, top ceremony, resistance strain, etc. the resistance strain is most widely used, and the measuring range is from tens to hundreds of kilograms.
