Delta DVP-15MC Series, Operation Manual

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DVP-15MC Series Motion Controller Operation Manual
B-2
B
B.1 Modbus TCP Message Structure

Modbus TCP message structure
Byte NO. Name Explanation
Byte0
Transaction identifier
High byte
0
Byte1
Low byte
Byte2
Protocol identifier
High byte
0
Byte3
Low byte
Byte4
Modbus data length
High byte
The number of bytes of
Modbus address and the
data after it.
Byte5
Low byte
Byte6
Modbus ID Single byte 0
～
16#FF
Byte7
Function code Single byte
Byte8
Register address in the
controller
High byte
0~16#FFFF
Byte9
Low byte
Byte10
Modbus data
High byte
The number of bytes of
Modbus data is
determined by function
code.
B.2 Modbus Function Codes Supported in Modbus TCP

Modbus function codes which DVP-15MC series motion controller supports
Function
code
Function Register
16#02
Read bit register value; maximum 256 bits of data could
be read at a time.
%IX and %QX
16#03
Read one single or multiple word register values;
maximum 100 words of data could be read at a time. %IW, %QW and
%MW
16#05 Write one single bit register value. % QX
16#06 Write one single word register value. %QW and %MW
16#0F
Write multiple bit register values; maximum 256 bits of
data could be written at a time.
% QX
16#10
Write multiple word register values; maximum 100 words
of data could be written at a time.
%QW and %MW