Hi,
I am trying to create a TAG context for a group of Modbus tags.
my data type is IEEE Double Precision Floating Point (8 bytes), and I need to write an expression for the TAG address so that the address will change by the meter number;
Meter #1:
TAG1 address: 31001/Double
TAG2 address: 31005/Double
TAG3 address: 31009/Double
Meter #2:
TAG1 address: 31021/Double
TAG2 address: 31025/Double
TAG3 address: 31029/Double
Meter #3 ......

can I use TAG Parameter Expression with TAG Data Suffix?

In your expression, you'll want to use the concat() function to append the datatype to the number.

For example, let's say that you have a property in your parent context tag with the name MeterNumber, then your address expressions would look something like:

CONCAT(31001+10*(\MeterNumber-1),"/Double")