In the PLC control system, the content that needs to be displayed mainly has timer value, counter value and data register value, and the data display method can be summarized into two fundamental types: one is based on the PLC data communication interface, such as RS-232, RS-485/422, and the display device also has such an interface, and the data display is completed through the data communication method.
According to the data display skills of communication, the data communication interface is used to transmit and display data, which is an effective way to complete the PLC data display. Mainstream PLCs now provide standard RS-232 or RS-485/422 interfaces, perhaps with module extensions to add such interfaces.
The communication modules 232ADP, 232BD, 485BD and 485ADP of the Mitsubishi FX2N can be used as data interfaces. The display device can choose a special intelligent display screen and a general computer (PC), and directly select the display screen or touch screen matched with the PLC, which can complete the centralized display of multiple data inside the PLC, and can use editing software to edit the screen graphics to improve the visibility of the display interface. The FX series can be matched with F93000T-BWD, F940GOT-LWD and F940GOT-SWD. The intelligent display screen reads the registers of the PL through the communication interface, and the data displays the power, which can simplify the planning of the control system. However, due to the cost of the display, the application of large-size display screen is limited, so this method is suitable for compact PLC control system. With the further improvement of computer performance and reliability, the control system in the form of "PC+PLC" has been widely used in the field of industrial control, PC with abundant software and hardware resources, can complete the online monitoring of PLC, concentrate on a lot of PLC internal data, can show the dynamic process flow and data trend curve of the control equipment in a graphical way, so that the human-machine interface of the system is intuitive and friendly.
PLC and the communication connection of the group Taiwang
1:1 station, spaced 15 meters apart, driven by a programming port
Communication through programming port (PLC does not need to be programmed)
1:N multiple stations (16 more stations), 50 meters > 15 meters apart> with FX485 drive
1:N multiple stations (16 more stations), 500 meters > > 50 meters apart, driven by FX485
1:N multiple stations (16 more stations), 1200 meters> > 500 meters apart, driven by FX485 (plus 485 relay)
RS485 can be wired in one or two pairs of wires. According to the use of the method to decide the connection, this plan is selected two pairs of wire connection method.
In order to establish the communication connection between PLC and Group Taiwang, the communication address and communication parameters can be set in the menu "PLC/serial port setting" of the PLC programming software, and the programming (MOV instruction) can also be completed directly in the software, according to RS485, the specific settings are:
The baud rate is set to 9600 bit/s, the data bit is set to 7 bits, the L bit is set to the start bit, the 2 bits are aborted, and the even check is selected, and protocol 1 is selected. Set with programming software, where the correspondence address is set in the D8121.
The accuracy of the timer is related to the arrangement of the program, and if the contacts of the timer are in front of the coil, the accuracy will be reduced. The average error is about 1.5 times the scan cycle. The small timing error is the input filter time minus the resolution of the timer, which is 1ms, 10ms, and 100ms for 1ms, 10ms, and 100ms, respectively.
If the timer contacts are behind the coil, the large timing error is 2 times the scan cycle plus the input filter time. If the contact of the timer is before the coil, the large timing error is 3 times the scan cycle plus the input filter time.
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