PLC communication module is used to complete with other PLC intelligent control, other communication between devices or computers. Following brief introduction to FX serial communication function expansion board, adapter and communication modules.
(1) communication expansion board FX2N-232-BD. FX2N-232-BD is to connect standard PLC and other RS-232C transport device interface board, such as personal computers, bar code reader, or printer. The panels can be installed inside the FX2N extension. The maximum transmission distance is 15m, the maximum baud rate for 19200bit/s. PLC using special software for the extension plate can be running monitoring, can also be transmitted from the PC to the PLC program.
(2) communication interface module FX2N-2321F. FX2N-2321F on connect FX2N series PLC can realize RS-232C with the other full–duplex serial communications interface devices, such as personal computers, printers, bar-code reading device and so on. FX2N series FX2N-2321F modules can connect up to 8 blocks. The module using FROM/TO command to send and receive data. Maximum transmission distance is 15m, the maximum baud rate for 19200bit/s. The modules take up to 8 I/O point. Data length and serial communication baud rate can be set by a special data register.
(3) communication expansion board FX2N-485-BD. FX2N-485-BD for RS-485 communication. It can be applied to no agreement on data transfer, FX2N-485-BD at the time of the original agreement, as a way, using RS instruction in personal computers, barcode reader, printer, data transfer between. Transmitting maximum transmission distance is 50m, the maximum baud rate for 19200bit/s. Each of the FX2N series PLC expansion boards can be fitted with a FX2N-485-BD communication. In addition to using this communication expansion boards and computer communications, it can also be used to achieve two parallel between FX2N series PLC.
(4) communication expansion board FX2N-422-BD. FX2N-422-BD to RS-422 communications, can be connected on the FX2N series PLC, and as a tool for programming or control a port. This interface is available outside of the PLC connected to PLC devices, data storage unit, and human-machine interface. FX2N-422-BD can be used to connect two data storage unit (DU) or DU–series unit and a programming tool, but one can only connect a programming tool. Every basic unit can be connected to a FX2N-422-BD and cannot be used with FX2N-485-BD or FX2N-232-BD.
(5) the interface module MSLSECNET/MINI
Use MSLSECNET/MINI interface module, series PLC of FX series PLC can be used as a local control station, constitute a distributed control system.
Above on the FX–series only gives a brief introduction to the communication module, specific application again in detail in later chapters.