ET200 S addressing I/O's

[Bryll]

Hello, We shall from a computer system communicate to a couple of Et200s nodes equipped with only digital inputs and outputs. The Communication is std profibus. I guess each input/output "slice" will take one byte, even if it's a four input or output unit. What is the start address for inputs ? What is the start address for outputs ?

[jstolaruk]

If I remember correctly (been a year since I did a Step 7 project) addresses are assigned in the HW configuration.

[Bryll]

No worries, I Think I figured it out now. The inputs and the outputs at each ET200S starts at byte 0. First digital input address is 0.0 and first digital output address is also 0.0. In the computer system do we need to specify how many READ and WRITE bytes the telegram shall consist of. So if I send a "1" to PB address 15, telegram byte 3.2, it means that output "2" of the third output module is activated. Just to install the GSD file to the computer system and get going