What is a weighing machine? How is the PLC connected? How to use the most accurate?
In order to better connect the PLC to the weighing machine in the processing plant, there are generally two ways to complete it: 1. Why should the weighing machine be used, the auxiliary instrument panel and the PLC simulation input must be added to the auxiliary instrument panel? Because the sensor is bent due to the net weight of the object to cause the working voltage data signal of the mv pulse signal, the PLC cannot load it immediately, so the auxiliary dashboard must be used to carry out the conversion. 2. The most accurate and most expensive way is to use weighing machine and PLC weighing sensor to carry out accurate measurement. This kind of method is the most accurate, because the PLC is connected to its own control module without damage, and the load of this method is The entry rate is also very fast, and it can be applied in a variety of complicated places. As an accurate measurement unit, it must be used carefully, otherwise it is very likely to cause inaccuracy or even destruction of accurate measurement. Be very careful when installing, otherwise the sensor is very easy to damage. 1. The polyurethane elastomer of the weighing machine is made of aluminum alloy profile, so all vibration or explosion caused by vibration will cause very large data information output deviation. 2. Strictly implement its design plan during the whole installation process. According to the technical nature of the machine and equipment, it can be installed horizontally or vertically, but the weighing part of the sensor must be closely related to the object under test. The weighing component and the measured object must not touch other bearing points of the machine and equipment, otherwise the accurate measurement will be inaccurate. 3. Sometimes it is necessary to use three or a large number of sensors to accurately measure the same object. The touch surface between this sensor and the weighing system must be level, otherwise the force will be uneven, which will harm the accurate measurement result. The resistor can adjust a slight level skew, but the adjustment ability is limited, so please maintain the level as much as possible during installation. Other common problems: 1. Wiring terminal. When several weighing machines are used, wiring terminal is an indispensable special tool. It can unify multiple weighing data information and reduce the workload of load cells. 2. The cable is connected and shielded, and the data signal of the sensor is finally transmitted according to the cable. For such high-precision data signals, little influence will cause the data information to be unstable. 3. There will be many impacts on specific industrial production topics, so many people are used to the application process to develop filters, but they can also be used for weighing, but it should be noted that the filter will only cause the data signal to lag behind, purely broken There is no problem with the observation and accurate measurement. However, if the result is calculated or manipulated by the accurate measurement result, the weighing result will be inaccurate. You must pay attention here. The above is a detailed introduction to the relevant professional knowledge of the weighing machine that I have summarized, and I look forward to helping everyone.
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