Siemens S7-1200 PLC LED DI/DO History

Question

Is there a way to review the Digital Input/Digital Output LED light history of a Siemens S7-1200 PLC?

If so, is it through the web portal or through Simatic and can someone point me in the direction of where to find such information?

Thanks - will save me a site visit if possible in any way.

Answer 1

There is no built in DI/DQ history for the S7-1200.

However, if you have some form of TCP/IP connection, this can be done quite easily.

When you call outputs in your main program, use a tag based calling system. Reference that tag, and have the tag's output be:

1. The required DQ
2. A TCP/IP message saying that this tag has risen or fallen.

For inputs, just send a message on the rise and fall of each input

It is likely easiest to hold this DI/DQ history on the server that is hosting this TCP/IP connection rather than the PLC itself.