Due to the high performance and high reliability of PLC, it has been widely used in the field of industrial control and has evolved from a simple logic control to a multi-function controller integrating logic control, process control, servo control, data processing and network communication functions. . Because the PLC itself does not configure the display function, it is very important to realize its internal data display, and it becomes a difficult point in the design of the PLC control system.
In the PLC control system, the contents to be displayed mainly include timer values, counter values, and data register values. The data display methods can be classified into two basic types: one is a PLC-based data communication interface, such as RS-232, RS- 485/422, display device also has such an interface, data display through data communication.
Communication-based data display technology uses data communication interfaces for data transfer and display, which is an effective way to achieve PLC data display. At present, mainstream PLCs all provide standard RS-232 or RS-485/422 interfaces, or add such interfaces through module expansion.
The Mitsubishi FX2N communication modules 232ADP, 232BD, 485BD and 485ADP can all serve as data interfaces. The display device can use a dedicated smart display and a general-purpose computer (PC). The display screen or touch screen that is directly matched with the PLC can realize the centralized display of multiple data within the PLC, and can use the editing software to edit the screen graphics to improve the visibility of the display interface. FX series can be matched with the display F93000T-BWD, F940GOT-LWD and F940GOT-SWD. The smart display reads PL registers via the communication interface, which provides high data display efficiency and simplifies the design of the control system. However, due to the high cost of the display, which limits the application of large-size display screens, this method is suitable for a compact PLC control system. With the further improvement of computer performance and reliability, the control system of 'PC+PLC' mode has been widely used in the field of industrial control. With rich hardware and software resources, PC can realize online monitoring of PLC and display a large amount of PLC internal data. The graphical display of the dynamic process flow and data trend curve of the control equipment makes the system's human-machine interface intuitive and friendly.
The communication between the PLC and the group king is connected to a station of 1:1, and the distance is <15 meters. The programming port is used to drive communication through the programming port (plc does not require programming).
1:N multiple stations (up to 16 stations), 50 meters> distance> 15 meters, drive 1:N multiple stations (up to 16 stations), 500 meters> distance> 50 meters with FX485, drive with FX485 1: N multiple stations (up to 16 stations), 1200 meters> distance> 500 meters, driven by FX485 (plus 485 relay)
The RS485 connection can be one or two pairs of wires. According to the use of the method to determine the connection, this design uses two pairs of wire connection.
In order to establish the communication connection between the PLC and the group too, you can set the communication address and communication parameters in the PLC programming menu “PLC/Serial Port Settingsâ€, or you can directly use the programming (MOV instruction) in the software. RS485 provides specific settings are:
The baud rate is set to 9600 bit/s, the data bits are set to 7 bits, the l-bit start bit, the 2 stop bits, even parity, and protocol 1 is used. Set with programming software, where the communication address is set in D8121.
In the PLC control system, the contents to be displayed mainly include timer values, counter values, and data register values. The data display methods can be classified into two basic types: one is a PLC-based data communication interface, such as RS-232, RS- 485/422, display device also has such an interface, data display through data communication.
Communication-based data display technology uses data communication interfaces for data transfer and display, which is an effective way to achieve PLC data display. At present, mainstream PLCs all provide standard RS-232 or RS-485/422 interfaces, or add such interfaces through module expansion.
The Mitsubishi FX2N communication modules 232ADP, 232BD, 485BD and 485ADP can all serve as data interfaces. The display device can use a dedicated smart display and a general-purpose computer (PC). The display screen or touch screen that is directly matched with the PLC can realize the centralized display of multiple data within the PLC, and can use the editing software to edit the screen graphics to improve the visibility of the display interface. FX series can be matched with the display F93000T-BWD, F940GOT-LWD and F940GOT-SWD. The smart display reads PL registers via the communication interface, which provides high data display efficiency and simplifies the design of the control system. However, due to the high cost of the display, which limits the application of large-size display screens, this method is suitable for a compact PLC control system. With the further improvement of computer performance and reliability, the control system of 'PC+PLC' mode has been widely used in the field of industrial control. With rich hardware and software resources, PC can realize online monitoring of PLC and display a large amount of PLC internal data. The graphical display of the dynamic process flow and data trend curve of the control equipment makes the system's human-machine interface intuitive and friendly.
The communication between the PLC and the group king is connected to a station of 1:1, and the distance is <15 meters. The programming port is used to drive communication through the programming port (plc does not require programming).
1:N multiple stations (up to 16 stations), 50 meters> distance> 15 meters, drive 1:N multiple stations (up to 16 stations), 500 meters> distance> 50 meters with FX485, drive with FX485 1: N multiple stations (up to 16 stations), 1200 meters> distance> 500 meters, driven by FX485 (plus 485 relay)
The RS485 connection can be one or two pairs of wires. According to the use of the method to determine the connection, this design uses two pairs of wire connection.
In order to establish the communication connection between the PLC and the group too, you can set the communication address and communication parameters in the PLC programming menu “PLC/Serial Port Settingsâ€, or you can directly use the programming (MOV instruction) in the software. RS485 provides specific settings are:
The baud rate is set to 9600 bit/s, the data bits are set to 7 bits, the l-bit start bit, the 2 stop bits, even parity, and protocol 1 is used. Set with programming software, where the communication address is set in D8121.
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