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Appendix B: Modbus-TCP Functions 37 (70)
B Modbus-TCP Functions
The Modbus-TCP protocol is an implementation of the standard Modbus protocol, running on
top of TCP/IP. The same function codes and addressing model are used.
The EtherNet/IP to Modbus-TCP linking device supports a subset of the functions described in
the Modbus-TCP specification.
Modbus-TCP transactions are normally transmitted and received on TCP port 502. The linking
device features the possibility to set TCP ports individually for each Modbus-TCP server.
For detailed information regarding the Modbus-TCP protocol, see the Open Modbus-TCP
Specification.
The EtherNet/IP to Modbus-TCP linking device supports the following Modbus-TCP functions:
Modbus Function Function Code
No. of Bits/
Registers
Direction Associated with Buffer
Read Coils
1 1-2000
Modbus to
linking device Input buffer
Read Discrete Inputs 2 1-2000
Read Holding Registers 3 1-125
Read Input Registers
4 1-125
Write Single Coil
5 1
Linking device
to Modbus Output buffer
Write Single Register 6 1
Write Multiple Coils
15 1-1968
Write Multiple Registers 16
1-123
Read/Write Multiple
Registers
23 1-125 read
1-121 write Bidirectional Input and output buffers
Modbus-TCP functions are used as important parts of transactions to Modbus-TCP servers. After
configuring a server within the Modbus-TCP network, functions can be assigned to it by clicking
the
Add transaction button in the built-in web interface.
Linking Device User Manual
scm-1202–181 2.0 en-US