Siemens Industry Online Support
Siemens AG
Entry type: Application example, Entry ID: 39026334, Entry date: 09/25/2014

GPRS/ Modbus Gateway (CE-X1)

  • Entry
  • Associated product(s)

The SIMATIC S7-200 components used in this application example are currently phased out.
This application can be realized as easily and quickly with the new SIMATIC S7-1200.

Furthermore, many useful applications with SIMATIC S7-1200 are available here: 35923253 Task description  
Several modbus nodes, consisting of S7-200 controller and PCs, are to communicate with a modbus master in a production area of a plant. A PC-based control center is to allow visualization and logging of process values of the production area. The decentralized production area is to be analogously linked to the control center with the Micro Automation Set 21, using a GPRS network.

This Configuration Example CE-X1 helps to solve the tasks displayed. The focus is on how to understand the combination of a GPRS-system and a Modbus-System via S7-200. Furthermore how to implement it into the S7-200 PLC to work as gateway for both systems. The focus is not on the Central Station side where the Micro Automation Set 21 solution is set.

To operate a SIMATIC S7-200 with a MODEM MD720 along with the Telecontrol Server Basic, revised/new block libraries are available under the following link 99522310.


Content of the downloads


Configuration Example X1 (Documentation to the Application Example) 39026334_CE-X1_S7-200_GPRS_Modbus_DOKU_V10_e.pdf ( 386 KB )
Startup-Code for the Configuration Example X1 (STEP 7-Micro/WIN projects, WinCC flexible Visualization, SINAUT Micro SC Configuration) CE-X1_S7-200_Modbus_GPRS.zip ( 2012 KB )

Further information



S7-200 System manual Entry ID: 1109582
Micro Automation Set 21 Entry ID: 22537809
Modbus-library for S7-200 Entry ID: 17470979

First version

Security information
Siemens provides products and solutions with industrial security functions that support the secure operation of plants, solutions, machines, equipment and/or networks. They are important components in a holistic industrial security concept. With this in mind, Siemens’ products and solutions undergo continuous development. Siemens recommends strongly that you regularly check for product updates.

For the secure operation of Siemens products and solutions, it is necessary to take suitable preventive action (e.g. cell protection concept) and integrate each component into a holistic, state-of-the-art industrial security concept. Third-party products that may be in use should also be considered. For more information about industrial security, visit

To stay informed about product updates as they occur, sign up for a product-specific newsletter. For more information, visit