In industrial sites, pressure transmitters, liquid level transmitters, temperature transmitters, differential pressure transmitters, humidity transmitters, soil moisture transmitters and other types of transmitters are becoming more and more common. The working power distribution mode of the transmitter is mainly divided into two-wire system and four-wire system, and the output signal is also different, and the common analog signal 4-20mA current signal, analog signal 0-5V, 1-5V voltage signal, digital signal RS485 and so on. In order to successfully collect all kinds of transmitter signals to PLC/DCS/FCS/MCU/FA/PC system, it is necessary to match and select according to the functions and technical characteristics of the transmitter and the data acquisition system, and also take into account the power supply difference between the industrial field transmitter and PLC and other data acquisition systems and the influence of various EMC interference, usually the signal output of the transmitter is isolated, amplified and converted to PLC and other data acquisition systems. The PLC collects the analog or digital signal of the transmitter through the signal line, and then processes it, if the transmitter is an analog output, the PLC should be connected to the analog input interface, and if the transmitter is a digital signal output, the PLC should be connected to the digital input interface. For the analog closed-loop control system, in addition to the input and output of the switching quantity, there should also be the input and output points of the analog quantity, so that the sampling input and adjustment output can realize the continuous adjustment and control of temperature, flow, pressure, displacement, speed and other parameters.

For the digital control system has a rotary encoder and pulse servo device (such as stepper motor), can use PLC to realize the function of receiving and outputting high-speed pulse, realize digital control, more advanced PLC also specially developed a digital control module, can realize curve interpolation function, recently launched a new type of motion unit module, can also provide a programming language of digital control technology, make PLC realize digital control more simply. If you have any questions about product consultation, product customization, agency, technical inquiry, quotation, etc., please contact Xingyi, 400-600-4496!