I have configured my Rockwell Micro 820 as a modbus server. I configured my VTSCADA driver tag as a modbus driver tag. i am able to read and write digital to my controller from VTSCADA to the 00000 registers. I am able to read analog from my controller on the 30000 registers in VTSCADA but I am unable to write to my controller on the 40000 registers. I do not have any error codes when i view the driver tag address. I created a new child under the communications driver tag as a I/O calculations tag and drew a numeric entry widget. How do I write to my controller?