Hi,

I keep getting a status of 16#8189. Can you take a look on my screenshot? I already tried using P#M100.0 WORD 10 and some more tags for MB_DATA_PTR but still get the same error. Btw, I'm using v13 (without any SP) and CPU 1212C fw4.0

Regards

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Split from Tips and sample program for MODBUS TCP.

Hi Kaulquappe,

The power meter which acts as the server is using 5xxxx (decimal address) for holding registers. Is there any workaround for this?

Regards,

wantutri

Hi all,

I tried reading data from register 40001 (using S7-1200) but I cant see any query from wireshark. I also tried reading data from register 40001 (using modbuspoll) and I can see both the query/response to/from the power meter.

My question is why cant wireshark sniff any Modbus/TCP packet from the PLC even though I'm getting 'DONE' in the status of the ModbusClient block. Are there still problems in my parameters? I've added a counter for the number of reading job done (11403) and the number of errors (0).

Setup:

• S7-1200 CPU1212C fw4.0: 192.168.1.50
• Power Meter: 192.168.1.10
• PC: 192.168.1.100
• TIA 13 (without any SP)

Regards,

wantutri

Look this post

https://support.industry.siemens.com/cs/document/109474481/how-can-you-read-input-words-in-the-address-range-from-9999-to-65535-with-the-simatic-s7-1200-via-modbus-rtu?dti=0&lc=en-WW