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7.2.5.3.2 Modbus FC 03 Read Holding Registers
Pressing the “Modbus FC 03 Read Holding Registers” button will take the user to the Modbus Holding Registers menu
for selection of desired field unit holding registers 3-15. Note that register 9 (status) is always required in the data table.
Selecting the “Next” button will advance the screen to a sample data table.
Figure 7.20 – FC 03 Read Holding Registers Menu
Figure 7.21 – FC 03 Example Data Table
Note: Data table shown with registers 8, 9, 10, and 11 selected (position, status, fault, digital outputs).
The 03 function code is used to read the binary contents of holding registers. This function code is typically used during
the network polling cycle. A network poll must consist of field unit register 9 (status) at minimum. See the following
tables for an example FC 03 message and a complete list of holding registers, respectively.
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