Hi,

I have described the issue on github topic where you can find log and flow files. 

github - S7-1500 - On variable read Bad Values 

To summarize, I'm trying to read boolean variable from S7-1500 (CPU 1511-1 PN, 6ES7 511-1AK02-0AB0, firmware 2.8.2) via IOT2050 where I have node-red (1.1.3). I'm using simple S7 Input node (node-red-contrib-s7, ver 2.1.1) that is trying to read variable (boolean) every 5 seconds from DB26.DBX0,0 (in node-red DB26,X0.0).

This test works with PLCSim Advanced V3.0 but not using real PLC. I have also tried to use node-red on Windows (local notebook with VPN to PLC) with the same result.

Optimized block access is deactivated, Full access (no protection) is selected, PUT/GET is enabled.

In debug window I get "Failure (Bad values)" (verbose log is attached).

I've seen similiar issue with S7-1200 resolved by updating the CPU firmware.Works on PLCSIM but only get "bad values" issue

Has anybody had similar issue and do you have any suggestion how to resolve this problem?Thank you in advance for any help.

Thanks for sharing!

In all our cases we got BAD VALUES when we trying to use wrong tag addresses or data types.