Hi

I have an S7-1500 PLC and a web server, is there a way to get my PLC tag value?
I tried using JSON-RPC method, but it seems like my PLC does not support this method.
My PLC is S71516-3 PN/DP 6ES7 516-3AN00-0AB0 with V1.8 firmware.

I read the LHTTP library, but it only applicable on V2.0 firmware and above. 

Thank you

Hello AutoGen_8443419

I would also say you would need a newer PLC for using somthing like LHTTP library

Bye Murof

yeah, that is the problem, the existing PLC is old model

guess I have to get the data via modbus tcp to other newer PLC first

thank you for replying

I really appreciate that!

Hello

Why do you want to do a Modbus TCP communication between two S71500?

There are plenty of other ways:

https://support.industry.siemens.com/cs/de/en/view/78028908

Bye Murof

No, I am using another brand of PLC for the data gathering
Modbus TCP is the easiest in my opinion. I will check the PDF you refer to, thank you for replying!

I really appreciate that! By the way, I am having a trouble with MB_SERVER. When I input the remote IP address to my PC IP address, Modscan cannot connect to the PLC, but when I change the IP to 0.0.0.0 it is working fine. Any idea what's going on?

Thank you for replying! I really appreciate that.

I was using another PLC brand for the data gathering by the way. However I am having a trouble with MB_SERVER block. When I input the remote IP address to my PC address, Modscan cannot connect to the PLC, but when I change it 0.0.0.0 it is working fine. Any idea what's going on?