PLC and computer through the RS485 bus remote connection to a central control system

A, the design of control system and the functional description of this system is applied to more vulcanizing tank work centralized monitoring, control machine for industrial computer ( PC） From the machine for the programmable controller ( PLC controller） System. Master machine is responsible for the vulcanizing tank vulcanization process parameters setting of the system, working status display, fault alarm display record and production state management. PLC controller is responsible for various vulcanizing pot of sequence control and sensor signal acquisition, PLC can work in two kinds of automatic and manual mode. Control system hardware is shown in figure 1. The vulcanizing tank can be seen from the diagram, control of PLC controller and computer through the RS485 bus remote connection to a central control system. In the process of communication, control of the PC as the main station, the vulcanizing tank PLC controller is from the station, and comply with the MODBUS communication protocol, count from standing for 12 at present. 流行, HMI text display four lines, each line 12 Chinese characters can be shown, your factory 'chausses' cutting machine transformation has been used. Manual work mode, each POP - on the vulcanizing tank operation box HMI display text for each vulcanizing pot of manual operation parameters and state display on the site. Automatic working mode, the process parameters set by the master industrial computer to complete. Vulcanizing tank working status, fault alarm information in two modes can be at the same time, the scene of the master control computer monitors and POP - HMI text display on the LCD screen display. Software running environment control software running under the Windows operating system of the industrial PC, computer has at least one serial port, hard disk space is not less than 80 g, memory is more than 256 m. Main function division * control picture ( Boot screen) According to the basic work of all vulcanizing pot state information, such as cavity pressure inside and outside, inside and outside the cavity temperature and curing time. * Sprite display detailed information for each of the vulcanizing tank working state, namely in addition to the pressure, temperature and curing time, also can show a vulcanizing tank valve state, such as limit switch state information. At the same time, the screen can also according to the time coordinate display work curve of the pressure, temperature, etc.
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