Mitsubishi PLC and Profibus connection

1, introduction

We PLC Profibus connection Mitsubishi know, PLC Profibus connection Mitsubishi the mitsubishi FX2N series <a href="/searchfanan.html?search=PLC&select=7">PLC itself is not support of Siemens Profibus bus, but in some projects, we need to put some occasions FX2N connected to the Profibus bus, at this point, a company of Profibus universal RS232 / RS485 bridge module CZP1 - PQ20 - T10ZL2-1 a can achieve this functionality.

2, the method

Bridge module as intermediate switching module, on the one hand, the Profibus protocol into RS232/485, the main information to FX2N from station, on the other hand, RS232/485 agreement into Profibus protocol, make FX2N from station to the main information, to ensure that the FX2N through the profibus-dp fieldbus and the main data exchange.

Concrete implementation method can adopt the following three:

1, direct connection FX2N programmable mouth, mouth agreement with mitsubishi FX2N of built-in programming, this method does not need to make any Settings on the FX2N and programming, just on the Profibus master station in accordance with this agreement programming from the data we can constantly, speaking, reading and writing, and FX2N will response host response data from the station.

2, through the FX2N communication module (FX2N232BD/FX2N485BD or FX0N232ADP/FX0N485ADP), use four mitsubishi protocol format or a format (specific agreement are detailed on the mitsubishi FX communications users manual), in addition to the Profibus site in accordance with this agreement programming need to continue to read and write data from the station, FX2N from station need basic communication format setting, but does not need to write communication response program, FX2N will automatically response.

3, through the FX2N communication module (FX2N232BD/FX2N485BD or FX0N232ADP/FX0N485ADP), write your own communication protocol, the method not only on the Profibus master station programming in accordance with the agreement need to continue to read and write data from the stand, also need the FX2N constantly respond to the main call from website written communications program. This method is more trouble while programming, flexible, but the agreement is very wide adaptability. Actually this method not only can be used on the FX2N series PLC, can also be used in other PLC and intelligent instruments, as long as both sides agreement set consistent, can be used this method, by a company of Profibus universal RS232 / RS485 bridge module CZP1 - PQ20 - T10ZL2-1 a, to realize the function of the device on a Profibus network.

3, the application example

In gen jie company always bearing an electronic equipment factory of pure water, automatic control engineering projects due to early using FX2NPLC control three sets of equipment into the Profibus network to unified monitoring, so we use the express company of Profibus universal RS232 / RS485 bridge module, considering the less as far as possible to modify the original program, and the programming on the FX2N mouth has been used in connection with a touch screen, so we have adopted the second approach, in the original FX2N programs only joined a short a few words of communication Settings, and on the main Siemens S7-300 PLC, with mitsubishi communications protocol format four configuration programming to continue to read and write information, successfully connects FX2N to Profibus bus.