Mitsubishi FX2N series PLC and host computer communication connection Settings

Due to the high performance and high reliability of PLC, currently has been widely used in industrial control field, and from the simple logic control development for logic control, process control and servo control, data processing and network communication function, which integrates multi-functional controller. Due to the PLC itself is not configuration display function, thus achieving its internal data show that becomes important, and become a difficulty of PLC control system design. In PLC control system, the need to display the main content of a timer, counter value and data register values, the data show that method can be divided into two basic types: category based on programmable logic controller (PLC) for data communication interface, such as RS - 232年,RS - 485/422, display device also has this kind of interface, data showed by way of data communication. Based on the communication of data display technology using data communication interface to transmit data and display, is the realization of the PLC data showed that the effective way. The current mainstream RS - PLC provide standards 485/422 or RS 232 interface, or by increasing such interface module extension. Communication module of mitsubishi FX2N 232 adp, 232 bd, 485 bd and 485 adp can be used as the data interface. Display device can choose special intelligent display and general computer ( PC) 。 Directly choose matching display or touch screen and PLC, which can realize PLC internal, according to the concentration of multiple data and can use edit screen graphics editing software, improve the visibility of the display interface. FX series can form a complete set of display screen has F93000T BWD, F940GOT LWD and F940GOT SWD。 Intelligent display reading PL registers from the communication interface, data showed high efficiency, and can simplify the design of the control system. But due to the high cost of the display, limiting the application of large size screen, so this method is suitable for compact PLC control system. Along with the computer performance and further improve the reliability, & quot; PC + PLC 'model of control system is widely used in industrial control field, a PC with abundant software and hardware resources, PLC can realize on-line monitoring, centralized display of PLC internal data, can be in the form of a graphical display control device of the dynamic process and data trend curve, the system of visual friendly man-machine interface. PLC and group too 1:1 communication connection of the king of a station, distance < 15 meters, with the programming port driver through programming port communication ( PLC don't need to do a programming) 1: N multiple station ( Stand up to 16) , 50 meters & gt; Distance & gt; Driver FX485 15 meters, 1: N multiple station ( Stand up to 16) , 500 meters & gt; Distance & gt; Driver FX485 50 meters, 1: N multiple station ( Stand up to 16) , 1200 meters & gt; Distance & gt; 500 meters, with FX485 driver ( Add 485 relay) RS485 connection can be a pair or two pairs of wires. According to utility method to determine the attachment, this design USES a two wire connection. In order to establish the PLC controller and the communication links, king set too in PLC programming software menu 'PLC/serial port Settings' set in the communication address and communication parameters, can be straight or move in software programming, MOV instruction) According to provisions of RS485, specific Settings are: baud rate is set to 9600 - bit/s, data bits set to 7, l a start bit, two stop bits, parity, by agreement 1. With the programming software Settings, including set up communication in D8121 address.
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