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R/W Digital/Analog I/O in Sinamics G120 via Modbus

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Hello people!

I need some help to do the follow in sinamics G120 via modbus:

Read a Digital Input: I read parameter  40240 with a V350 (239 in unilogic) but always is in 0

Write a Digital Output: I write parameter  40220 with a V350 (219 in unilogic) but always is in 0

Read Analog input: I read parameter  40260 with a V350 (259 in unilogic) but always is in 0

The communication is ok because I can command the motor with parameter 40100 (writting 47F and 47E) and  change the speed in parameter 40101.


Best Regards 



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  • MVP 2023


Please read p.101

What do slave when Invalid read requests...

And p.102 about write.

Please check registers that you mark in your previos topic. Some of them may disable external request to slave.

SIemens use system of binector for configure signal flow inside the device. Please check via Siemens software  signal flow from Inputs and to outputs.

Sometimes user must to define control sorce...


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