SECTION 5 Modbus Communications Procedure
5-6
5.2 Function List
The following table lists the function codes.
Function Code List
Function code Name Process
03 (H'03) Read variable
(multiple)
This function reads from variable areas.
It is possible to read two or more consecutive variables.
16 (H'10) Write variable
(multiple)
This function writes to variable areas.
It is possible to write two or more consecutive variables.
It is also possible to broadcast this function (broadcast
transmission).
06 (H'06) Write variable
(operation com-
mand)
This function writes an operation command.
It is also possible to broadcast this function (broadcast
transmission).
08 (H'08) Echoback Test This function performs an echoback test.
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