You can read a single bit or bit range of a data point, for example to extract a field from a multi-property data point.
Before you begin
What you should know
- You can only read specific bit ranges for data points from input registers and holding registers. Coils and discrete inputs have only one bit.
- Modbus registers store the most significant bit at the lowest storage address (big-endian). The Industrial IoT plugin interprets Modbus registers correctly. However, in the user interface, bit 0 represents the least significant bit and bit 15 represents the most significant bit.
Procedure
-
In the Data point section, select and input or holding
register, and click Edit the data point (
).
-
Select Bit range and enter the positions of the first
and last bit that constitute the value you want to read.
