Shulou(Shulou.com)06/01 Report--

In practical projects, there are often multiple PLC need to communicate with each other, the distance may be from tens of meters to thousands of meters, and some customers need to monitor the status of PLC remotely through the Internet.

This paper introduces a realization method of PLC wireless communication, which adopts giant control GRM200 series PLC special wireless communication module, which supports connecting Siemens S7200 PLC through PPI protocol and Siemens S7300 / 400 PLC through MPI protocol. The PLC side does not need programming. At the same time, the special wireless communication module of Macro PLC can also directly support PLC including Mitsubishi PLC, OMRON PLC, Delta PLC, Panasonic PLC and Yonghong PLC. PLC, such as Schneider PLC,AB PLC, to monitor PLC status through the Internet.

PLC dedicated wireless communication products support the following six functions:

1. Short message alarm function, when the equipment fails, you can send an alarm message or set a call notification, which can really ensure the safety of the equipment and achieve unattended. You only need to do a very simple setting in the module. There is no need to write any program in PLC or download the PLC program again.

two。 Access the web web page through the mobile phone or computer, directly monitor the status of PLC variables, and control PLC through the Internet.

3. The remote wireless monitoring between configuration software and PLC can remotely monitor multiple PLC or instruments supporting modbus communication through configuration software, and remote centralized monitoring can be realized through GPRS network.

4. Download and monitor PLC programs remotely. When there is something wrong with the equipment, as long as your computer is connected to the Internet, you can access your PLC, modify the program, and maintain the equipment anytime and anywhere.

5. Short-distance wireless communication between multiple PLC, if multiple PLC are located in the same factory area, short-distance wireless communication can be realized, wireless communication between various models of Siemens PLC can be easily realized, wireless communication between different manufacturers' PLC can also be realized, and it is also suitable for wireless communication between configuration software and PLC in short distance (3KM), touch screen and PLC, sensor and PLC, sensor and touch screen, PLC and PLC. Compared with other similar products on the market, the PLC side does not need programming and is easy to use.

6. The remote wireless communication between multiple PLC, such as the data exchange and transmission between the PLC located in Shanghai and Guangzhou, can be the PLC of the same manufacturer or the PLC between different manufacturers.

The PLC protocols supported by the GRM module are as follows:

★ Siemens S7-200 PLC:PPI protocol

★ Siemens S7-300400 PLC:MPI Protocol

★ Mitsubishi FX full range PLC: support FX1N,FX2N, FX3U and other PLC through 485-BD

★ Mitsubishi Q series PLC:MELSEC communication protocol

★ OMRON series PLC:HOSTLINK protocol

★ Delta Series PLC: Delta Protocol

All kinds of PLC:MODBUS protocols made by ★

Advanced Application of online Monitoring of PLC and other equipment through the Internet

Access the web web page through the mobile phone or computer, directly monitor the status of PLC variables, and control PLC through the Internet.

It can also be remotely monitored to multiple PLC or instruments supporting modbus communication through configuration software, and remote centralized monitoring can be realized through GPRS network.

PLC---PLC wireless communication interconnection (short-distance wireless communication between PLC or long-distance communication through GPRS)

It can support PLC scattered in different places to read and write data to each other.

Wireless Communication and Interconnection of PLC--- configuration Software

Support wireless data transmission between configuration software and multiple PLC

PLC--- touch screen wireless communication interconnection

Support wireless data transmission between touch screen and multiple PLC

Sensor-PLC wireless communication interconnection

The master station can collect the switch or analog data of the remote slave station, and a slave station can take 8 digital analog inputs and 4 relay outputs.

The above schemes, equipped with GPRS interface (GRM21X), can realize remote Internet monitoring and SMS functions of mobile phones, web pages and computers at the same time.

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