Hello everybody.

For my automation projects with PN slaves (HMI, ET200 I/O, G120 inverters and S120 servos) i wanna write a PLC macro/function, to put inside OB82, which will diagnose the health of the bus and the health of its devices.

I don't need too much specific informations, i only want to know, in case of PN failure:

- the health of the PN bus (cable disconnected from device/s and/or bus anomaly);

- in case of PN device/s fault/s, which (only which, not why...)  is/are the bus' device/s which is/are in fault status.

About that i'm asking you which are the proper S7 library instructions to use for this purpose.

Keep in mind that I can use both CPU S71200 or S71500 and the PN fieldbus can be structured with many kind of devices (I/O, inverters, servos and HMIs).

Many thanks in advance.

Hello, your last point (S7-1200; S7-1500) ist the important!

here are some good information about S7-1500

-> https://support.industry.siemens.com/tf/ww/en/posts/89486/

-> https://support.industry.siemens.com/tf/ww/en/posts/89419/

System Diagnostics with S7-1500 and TIA Portal

https://support.industry.siemens.com/cs/ww/en/view/68011497

Tips for Diagnose in S7-1200 user program

https://support.industry.siemens.com/tf/ww/en/posts/43759/

With the S7-1200, how do you read out the diagnostics data of a PROFIBUS DP slave with the "DPNRM_DG" instruction and how do you evaluate the data in the user program?

https://support.industry.siemens.com/cs/ww/en/view/66439168

hope that´s not too much! 

To Arno81.

Many thanks!

I have enough documentation to learn...