3. Modbus/TCP
3 - 1
3. Modbus/TCP
3.1 Outline
POINT
Modbus/TCP is available with servo amplifiers with software version A3 or later.
The following are shown in the "Data Type" in this instruction manual.
I8 or U8: 2 bytes
I16 or U16: 4 bytes
I32 or U32: 8 bytes
VS: VISIBLE STRING
The following are shown in the "Access" in this instruction manual.
"ro": Only reading is available.
"wo": Only writing is available.
"rw": Reading and writing are available.
The Modbus protocol, developed for programmable controllers by Modicon Inc., has evolved into the
Modbus/TCP protocol for use over TCP/IP.
The Modbus master acts as a TCP client, and the Modbus slave acts as a TCP server for client-server
communication. Using the functions in the message frames enables to read or write data from/to
parameters, write input commands, and check operation status of servo amplifiers.
For MR-JE-_C servo amplifier, Modbus registers are assigned like the address assignment of CiA 402 drive
profile.
A Modbus-compatible controller, the client, can communicate with the MR-JE-_C servo amplifiers that are
servers by accessing assigned holding registers.
3.2 Communication specifications
Function
Description
Communication protocol
Modbus/TCP protocol
Conformed standard
OPEN Modbus/TCP SPECIFICATION
Port No.
No. 502
IP address
IPv4 range: 0.0.0.0 to 255.255.255.255
Use the same network address for both a client and servers.
Default value: 192.168.3.0
Subnet mask
Default value (recommended): 255.255.255.0
Message format
Refer to section 3.3 to 3.5.
Physical layer
100BASE-TX
Communication connector
RJ45, 1 port (CN1)
Communication cable
CAT5e, shielded twisted pair (4 pair) straight cable
Network topology
Star
Variable communication speed
100 Mbps
Transmission speed between stations
Max. 100 m
Waiting time setting
None
Maximum number of connections
3
Server function
Number of request messages that are
receivable simultaneously
1
Содержание MR-JE-C Series
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