Due to its high performance and reliability, PLCs have become widely used in industrial control systems. Over time, they have evolved from basic logic control to multi-functional controllers that integrate logic, process, servo control, data processing, and network communication. However, since PLCs do not come with built-in display capabilities, it is crucial to implement internal data visualization, which has become a key challenge in system design.
In PLC-based control systems, the main data to be displayed includes timer values, counter values, and register contents. There are generally two main methods for displaying this information: one involves using the PLC's communication interface, such as RS-232 or RS-485/422, where the display device also supports the same interface and communicates directly with the PLC to show the data.
Communication-Based Data Display Technology
Using a data communication interface is an efficient way to visualize PLC data. Most modern PLCs provide standard RS-232 or RS-485/422 interfaces, or they can be expanded via modules. For example, Mitsubishi FX2N series supports communication modules like 232ADP, 232BD, 485BD, and 485ADP, which serve as data interfaces.
The display devices can either be specialized intelligent screens or general-purpose computers (PCs). Selecting a screen or touch panel compatible with the PLC allows centralized display of multiple internal data points. With appropriate software, users can edit the screen layout, improving the visual clarity of the interface. Models like F93000T-BWD, F940GOT-LWD, and F940GOT-SWD are commonly used with the FX series. These intelligent displays read data from the PLC registers through the communication interface, offering high efficiency and simplifying the overall system design.
However, due to the cost associated with large displays, this method is more suitable for compact PLC systems. As computer performance and reliability continue to improve, the "PC + PLC" configuration has gained popularity in industrial applications. PCs offer rich software and hardware resources, allowing real-time monitoring of PLC operations and displaying a wide range of internal data. Graphical representations of process flows and data trends make the human-machine interface more intuitive and user-friendly.
PLC and Group Taiwang Communication Setup
1:1 single station, distance less than 15 meters, connected via the programming port.
Communication via the programming port (no need for programming on the PLC).
1:N multiple stations (up to 16), distance between 15m and 50m, driven by FX485.
1:N multiple stations (up to 16), distance between 50m and 500m, driven by FX485.
1:N multiple stations (up to 16), distance between 500m and 1200m, driven by FX485 with a 485 relay.
The RS485 connection can use one or two pairs of wires. Based on the application requirements, this design uses two pairs of wires for reliable communication.
To establish communication between the PLC and the Group Taiwang system, the communication address and parameters can be set through the "PLC/Serial Port Settings" menu in the PLC programming software, or directly via programming instructions like MOV. The specific settings for RS485 include:
Baud rate: 9600 bit/s, data bits: 7, start bit: 1, stop bit: 2, even parity, protocol: 1. The communication address is typically set in D8121 using the programming software.
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