I have a cb1241 communicating to a 3rd party device via modscan rtu

It is working on modscan using adam converter (great job)

I see the data when using modscan but am getting nothing on the data block in the PLC when I try that.

I have copied the address, incremented it decremented it tried different lengths on data pointer. TO-TO, swapped the AB cables (that did work better as it was stuck on constant busy all the time)

the mb_comm_load is reaching done, connection seems ok. The Mb_Master is flashing busy as the clock pulses so also seems ok.

I would of thought the address should of been the same with modscan and PLC but alas not. What should I be checking?

In modscan the address is holding register 12556, so Siemens address 412556 or 412557?

Images on the attachment.

The issue was that the data was in the input registers all the time and holding registers only  some of the time so the data was located from address 30,000

I had to use mode 104 on the block with the newest version of the mb master block. not the legacy block.

in this FAQ

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-s7-1500-via-modbus-rtu-?dti=0&lc=en-GB

Good luck. Through perserverance we get there, just as well we are payed by the hour..

Hello Hadwll2,

thank you for providing your solution to the community! 

Kind regards, Moderator_Lan