Steel coil weighing system based on PLC

Coil weighing system based on PLC newmaker welcome to e hall exhibition hall 3 PLC PLC programmable controller, PLC programming cable. 。 。 1 introduction in steel enterprise in the production of each link, often need to weighing of coil, and upload the resulting weight to the production management system, in order to facilitate production monitoring and management. Usual adopts industrial computer and electronic control, the use of this control mode, poor reliability, automation degree is not high, and costly. There are many enterprises using programmable controller ( ） To modify traditional access control, greatly improve the reliability of the control system and automatic control level, for the enterprise provides a more reliable production security. This paper in the PLC controller to control weighing link solution in Taiwan, its circuit structure is simple, less investment, Can use the existing facilities renovation) , the system is not only a high degree of automation, with functions of on-line modification, flexibility is strong, also the related data to the PC. System design 2. 1 control control system according to the production line of steel rolls to the specified location, start receiving procedures, weight when receive complete weight, and stop the pump; The operator can remove the confirmation button sound alarm signal, the flashing lights turn flat; System has a manual/automatic two kinds of control mode, and there is the function of test. 2. 2 type selection of PLC system in the implementation of equipment type selection and follow the following principles: ( 1) Generality: full consideration in the selection process of spare parts purchase convenience, in the case of meet the design requirements as far as possible choose general equipment. （ 2) Standard: as much as possible in the selection and programming using standard method to get the system equipment manufacturers may provide upgrade support in the future. （ 3) Reliability: as far as possible increase in anomaly detection, at the same time, considering non-critical equipment failure fault tolerance of the system, and improve the system reliability; For key equipment, the use of redundancy methods, shorten downtime to a minimum. （ 4) Price: the choice of PLC PLC communication function, performance and low cost should be considered, choose function fairly high reliability, load capacity, appropriate economical PLC. PLC controller single machine can be extended to five, in addition to the standard communication protocol, also can choose modbusascii/rtu/TCP protocol or custom, at the same time there are 6 kinds of communication board 8 kinds of communication module can easily meet the flexible choice of different applications, for PLC controller, at the same level and the economic benefits, so choose PLC economical host (Taiwan Model is: the FBS - 10ma） The exhibition of the weighing instrument, match with Taiwan ex2002 control. 2. 3 system hardware configuration for external only two light output and need only have two communication ports, FBS - choose PLC minimum points 10 ma, can be convenient to meet the control requirements. System during normal operation, because the weighing control instrument with PLC, using the same power supply at the same time, so don't have to do the supply directly by watching electronic scale then know that the power of the work, improve the utilization rate of I/o port to save I/o points. 3 control system software design program flow is shown in figure 1. 3. 1 I/o variable definition such as I/o variable definition system hardware configuration is shown in figure 2. 3. 2 system design ( 1) This system for liquid level of on-off control system. Liquid level can be divided into four period of setting and display, at the lowest level and pump automatically, to stop the pump automatically when liquid level reach the set value. （ 2) Using il/ilc branch instruction, through 0008 knob achieve two functions of manual/automatic selection, automatic indicator, when 0008 knob closed system executing il/branch of ilc program, complete the automatic monitoring; When 0008 knob to open the manual indicator, system outside the executive branch program, by 0010, 0011 knob manual pump, stop the pump. （ 3) Liquid level from 0004 ~ 0007 knob low, low, high, high four Settings, system Settings, from low to high priority when multiple setting knob closed at the same time, the low level set is preferred. （ 4) Using reed pipe detection level, when the liquid level arrived at first, the contact closure, indicator light; Left first, its contact open level, in order to ensure the corresponding measurement period of light is not immediately go out and not being affected by the fluctuation of the liquid level, each indicator light control adopts keep keep instruction, only when the liquid level rising or falling to the adjacent segment lights to go out. （ 5) When the liquid level to check points, liquid level indicator lights flashing, flashing lights factor with internal flash internal standard 1902, flashing for 1 s period; If the liquid level reached set value, stop the pump automatically, and set up the electronic sound alarm, alarm design for ring 3 s 2 s, circulation automatically stop after 30 s, or in the 30 s to 0009 confirm button to stop the sound, light is flat. Electronic sound alarm and stop also consider liquid level fluctuation of pump, the design adopts keep instructions and difu differential joint can be used. （ 6) Driving for the first time, the liquid level below or above the lowest level, need to manually kai pump first, and then switch to run automatically; Or enter the test way, according to the lowest level test button to start the pump, then into the automatic operation mode. 3. 3 the PLC ladder diagram design ( 1) Define port1 / port2 communication parameters ( The reference manual in chapter 11) 4 the conclusion of this control system control protocol is simple and convenient, as long as with communication function of PC can establish communication with, plus a protocol converter can be local or overseas. Since the successful design in guangzhou economic development zone of a large stainless just adopted by large-scale enterprises, users get the praise, use process worthy of similar enterprises promotion and use.
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