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Estoy haciendo una aplicación para un M91 como esclavo en una red MODBUS RTU, pero tengo dudas acerca de la configuración en el código y del propio hardware. Agradecería si alguien tiene una aplicación ejemplo de como configurar. Por ejemplo, no sé si se deben guardar las variables que se quieren leer desde el maestro en alguna dirección en concreto de mi M91 esclavo. En SIEMENS se guardan en las direcciones propias de la comunicación MODBUS 40001, 40002, 40003..., pero no se como se realiza en U90 LADDER.

Por otro lado no estoy seguro de si tengo que configurar mi PLC en red, o como PLC único desde la ventana "PC communication port settings"

Gracias y un saludo.


I'm doing an application for an M91 as a slave on a MODBUS RTU network, but I have doubts about the configuration in the code and the hardware also. I would appreciate it if someone has a sample application of how to configure it. For example, I don't know whether to save variables that you want to read from the master in any particular direction of my slave M91. In SIEMENS they are stored in the addresses of the communication MODBUS 40001, 40002, 40003..., but I do not know how it is done in U90 LADDER.

On the other hand I am not sure if I have to configure my PLC in network, or as a single PLC from the window "PC communication port settings"

Thank you and a greeting.


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Have you checked out the examples under Help, Sample U90 - Modbus.

Also Check Help  -- MODBUS  -- Copy to Google for Translation   if a Help Version is not available in your language.

Also Look at   --  Special Functions  --  Modbus Commands are done as Special Functions using registers(SI's)  

U90 Ladder does NOT HAVE function blocks like VisiLogic.

In U90, the  Modbus function does the translation from   MI 1  to the Modbus register number     and     reverse






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