Schneider Electric LUFP9

6. Configuring the Gateway

6.11.2.4. Configuring the Content of the Query Frame

The window shown below is obtained using “Edit Frame” from the “Query” menu. Unlike the tree structure in the

main AbcConf window, this display has the advantage of showing all of the frame’s fields at the same time as well

as their values. The values displayed below correspond to the values assigned by default to the Modbus command

query we have created. The correspondence with the content of the corresponding Modbus frame has been added

underneath this window.

Slave no. Function no. Word number

(MSB / LSB) Value of the word (MSB / LSB) CRC16 (LSB / MSB)

Edit the values which are not greyed out, one after another. There is a description of them below.

The nature of a frame’s fields depends on the Modbus command to which it corresponds. However, a certain

number of these fields are common to all frames, whereas others are common to a number of them. Here is a

description of those shown above, for the example described at the beginning of the chapter 6.11.2:

Field in the

frame

Size in the

frame Description

Slave

Address

1 byte This field cannot be changed by the user and its value is greyed out to inform

him of the fact. AbcConf updates the value of this field automatically using the

address of the Modbus slave corresponding to the current node.

N.B. This field is common to queries for all Modbus commands.

E.g. The value of this field is set to the address of the Modbus slave which

corresponds to the “ATS48” node, that is to say 16#0A.

Function 1 byte This field cannot be changed by the user and its value is greyed out to inform

him of the fact. AbcConf updates the value of this field automatically using the

function code for the corresponding Modbus command.

N.B. This field is common to queries for all Modbus commands.

E.g. The value of this field is set to the code for the “Preset Single Register”

command (writing the value of an output word), that is to say 16#06.

field designates the memory object to which the command relates.

N.B. This field is common to queries for all Modbus commands whose purpose

is to access one or more locations in the memory of a Modbus slave. When

accessing several memory locations, the “Register” field designates the

address of the first word affected by the command.

E.g. The value of this field should be changed by entering the address of the

CMD command register, that is to say 400 (16#0190). This value will be

automatically converted to hexadecimal if the user enters it in decimal.