I am wanting to read a variety of registers over modbus RTU to a ABB VFD. I have a few questions/concerns. There is a potential of 100+ drives I am wanting to read, so I hoping I can use just topic A and assign the individual Modbus ID for the parameter I am wanting to read. For example I assigned a tag to 40101,1. Individually it works fine. However… If I add another tag and its not consecutive i.e 40103,1, I get a red flag and the error is “unknown” (see image 2). But, if the tag was assigned 40102,1 no errors and works fine (see image 1).
A) Is there a reason why the tags have to be consecutive? Perhaps I am doing something wrong?
B) Any concern reading 100+ modbus RTU drives with 5-6 tags each?