The dosage system enters directly into the corresponding weighing controller through the signals of the weighing module. The weight signals are transmitted to the programmable controller through the serial port or through the Modbus protocol weighing controller. The programmable controller controls the final control valve of the dosage in each bin according to the dosage weight, in order to increase the required dosage weight. The communication with the configuration is realized by using 485 bus. S7-200 series has the functions of recipe setting, dosage control, dosing, report printing, remote alarm and other functions to realize remote monitoring.
020-34563445The automatic feeding system adopts DCS centralized control mode, and selects Siemens S7-300 PLC to constitute the data acquisition and control system, which is modularized design and economical and practical. The human-machine interface monitoring software adopts "Configuration King", which is the leading configuration software in the field of industrial control in China and has the advantages of good openness, easy maintenance and secondary development. All process control data and equipment operation status can be centrally managed, recorded in real time, and printed and consulted at any time.
The automatic feeding system consists of two computers as the human-machine interface of the whole system. One of them is the master station, which completes all the system parameters setting, process monitoring and data recording; the other one is the slave station, which takes the master station as the support, and is in charge of the data setting and process monitoring of the Batching system after the master station. The master station communicates directly with Siemens S7-300 PLC system, the automatic control instrument of the front dosage scale and the rear dosage scale. It measures the flow rate of the conveyed material.
The former dosage monitoring system on site adopts sealed junction box, which is dust-proof and moisture-proof, and can ensure reliable signal transmission. The former dosage scale instrument adopts special industrial process controller, which realizes communication with the central control room through RS-485 bus, and can be controlled independently as well as realize PLC on-line control. The signal detection of each valve position and unloader position adopts Hall sensor, which has the characteristics of non-contact, anti-interference, anti-dust and humidity resistance. The bin level adopts heavy hammer type material level meter, which can realize continuous bin level detection. The main scale of post-dosing monitoring system adopts high-precision dosing scale, the attached material adopts reduction scale (loss-in-weight scale), screw conveyor, flow detection adopts indirect method, that is, real-time detection of pipeline pressure through the pressure transmitter, and judging by the pressure change whether the outlet and inlet are blocked or not.
The monitoring function of the feeding system has the functions of human-computer interaction, communication, display and storage, printing, etc. It also has data and graphic display, status monitoring, data input, information storage and other functional screens related to various operations. The weighing and batching system can realize real-time process data monitoring, simulation display of process flow, real-time data record checking, system operator privilege setting, process parameter setting, setting alarm for running process events and switching between manual and automatic control. The monitoring system on-site control instrument real-time display of flow, load, cumulative value, temperature, etc.. Temperature indication through the field temperature display instrument, pressure indication through the field pressure display instrument and motor current through the field display instrument is transmitted to the centralized display in the control room. The frequency converter regulation is equipped with automatic switching switch and communicates with the main control computer.
