Hi all, 

Recently i had tried to use S71200 Modbus RTU 485 to do the communication in between master and slave. I have various of data type (BOOL, INT, REAL) to communicate in between. ! assign array of Boolean then it work well to send and receive between master and slave. But i tried to assign another array of real, it cannot read and send even on this real array section. Anyone can help to guide on this? which part had i miss assign? Appreciate for help. 

Here attached my programming PDF. 

thanks alot. 

Hello JasonBetbet

I´m no Modbus professional but have you tried to use an array starting from 0 as in the boolean arrays? does it make any difference?

and here some basic information:

https://support.industry.siemens.com/cs/ww/en/view/47756141

Bye Murof