Wireless Communication Between PLC


Is it possible to communicate two PLC or Multiple PLC's using any Wireless Protocol (GSM, Radio etc...) even transfer data between them.

For Example: i have PM573-ETH at a location and another PLC PM554-ETH somewere around 50km away and another PLC 25km away, Now i need to Send/Receive data of their tags to one another

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Meer Arshad Ali   

asked 4 months ago




Yes it is possible for wireless communication between two PLCs. In one project where I worked, we used radio frequency ethernet modems to establish communication between two AC500 PLCs using Modbus protocol.

We had a line of sight distance of 2 km.Based on this information, the power of the Tranceiver was selected.

RF modems work best if the transceivers do not have any thick obstacles like mountains or buildings in the direct line of sight. For a 25km distance of transmission, the power of the antennae must be quite large.

In another project, we had established communication between an AC500 PLC and a SCADA PC via 3G internet, using a GSM SIM modem.However, this solution required the use of a static IP at SCADA PC side.

Refer to the link for more information.




answered 4 months ago


By Meer Arshad Ali on 9/26/2017 | Like (0) | Report

Can you tell me how you did communication between AC500 and a SCADA pc over a GSM SIM Modem...
Using a illustration of sample logic

By rahilmohammed on 9/26/2017 | Like (1) | Report

Hopefully tomorrow I can share a doc.

By Meer Arshad Ali on 9/26/2017 | Like (0) | Report

sure, thanks

By rahilmohammed on 9/26/2017 | Like (0) | Report


I am unable to share the complete document, as the software was custom designed for our application and is bound by license terms.

Please find below an excerpt from the setup manual which I had created based on the the product manual.
"The M2M terminal (GSM/GPRS Modem) is an intelligent device designed for remote data acquisition from any Modbus RTU (Ex: PLC) connected to its RS-485 port and for transmitting the acquired register data of the RTU device to a remote server via GPRS using Socket protocol (Static IP + Port No=23001). The port no 23001 must be specified in the internet router device through which the static IP based internet connection is provided to the SCADA host PC, i.e. the port 23001 must be mapped to port 502 in the translation table of the router.
The modem acts as a TCP/IP client, whereas, the PC on which the Modbus gateway application and the MODBUS TCP/IP master (SCADA) operate acts as a TCP/IP server. For successful communication, it is necessary for the server PC to have a static IP internet connection. However, it is not necessary for the client device (modem) to have a static IP based internet connection; Dynamic IP based GPRS connection is sufficient.
The client device (GPRS modem) initiates a TCP/IP connection with the server. After the connection is established between the two, data transfer can occur in both directions. The client exchanges data with the server on the server port 23001.
In case the connection is lost, the M2M modem will try to re-establish connection with the server at the end of every heart beat interval. Hence, the modem will always try to stay connected to the server, thus allowing the MODBUS TCP/IP master application (SCADA) to send queries to a single slave device connected to the modem’s RS-485 port , as well as receive responses from it (duplex communication).
Any number of modems may be connected to the server PC, but a modem can be interfaced with only one serial device. Each modem should have a unique site ID, but the slave ID can be same.

Note:Concept of Network/Port Address Translation is used to map unregistered port 23001 (option to modify was available to us) to well known modbus port 502.

Hope this gives you some idea.Anyways, you will end up contacting a solution provider, who will guide you further.

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I would recomend using the Red Lion Sixnet hardware for GSM.

Red Lion tech support is excelent.



answered 4 months ago


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