Hello,

atul.cvs

Hello All

I'm very new to siemens & drives.

I have successfully communicated V20 drives with S7-1200 over Modbus RTU & I'm able to read the parameters in PLCs over specified address.

But when I try to write the frequency on Modbus address 40101. Its not writing frequency to V20 even I don't get any error in my MB_Master block & I get the done bit from MB_Block. (While reading I keep mode 0 & while writing I keep mode 1).

Can anyone please guide me what I'm doing wrong here.

Regards

Atul Sonawane

 if I could give next tips here. With write procedure I expect also to have finished all read procedure, set execution on block to false, change parameters and again set execution of block with new parameters set. Simply I expect correct handling of this 2 different procedures because in case of mix and not correct set is then problem. It can be very helpful to give us some screemnshots to see your set parameters for writing procedure, especially from manufacturer doc of device that parameters (address, data type spec) to have better look at your situation. Another good step is always to try test with PC app as MB Client, set required write parameters and do that tests if all is ok. Then it can be better to solve your PLC situation and you can be sure that all is working ok prior do any step on PLC.