Function List; Outline Of Modbus/Tcp Protocol - Mitsubishi Electric MR-JE-C Series Instruction Manual

3. Modbus/TCP

3.3 Function List

Functions that can be implemented are as follows. Operation and maintenance of the servo amplifier can be
performed remotely.
Function
Status monitor
Parameter setting
Point table setting
Current alarm read
Alarm history read
Parameter error number read
Point table error number read
I/O monitor
Servo amplifier information read
Motor drive

3.4 Outline of Modbus/TCP protocol

In Modbus/TCP communication, a command that a client (controller) sends to servers (servo amplifiers) is
called "Query Message", and a command that the servers return to the client is called "Response Message".
When a servo amplifier receives a Query Message, it returns a Response Message to the client after the
servo amplifier response time.
In Modbus/TCP communication, as in the case of TCP/IP, make sure to establish the connection before
sending and receiving commands. Check that the connection has been established, and then send a Query
Message.
Client (controller)
Server (servo amplifier)
Note. The servo amplifier response time differs depending on the command to send.
Reads the items in "Display all", the monitor function of MR Configurator2,
such as the servo motor speed and droop pulses.
Reads and writes data from/to parameters.
Reads and writes point table data.
Reads alarm numbers that currently exist.
Reads the history of up to 16 alarms.
Reads the parameter number at occurrence of a parameter error.
Reads the point table number at occurrence of a point table error.
Reads the ON/OFF state of external I/O signals and the status of the I/O
devices
Reads the servo amplifier model and software version.
By accessing to holding registers which are assigned like the address
assignment of CiA 402 drive profile, the servo motors are driven.
POINT
If connection with a client disconnects during establishment, the connection may
not close and this may cause reconnection failure. In case you cannot
reconnect, cycle the power of the servo amplifier.
Query Message
Response Message
Servo amplifier response time (Note)
Description
Query Message
3 - 2
Detailed explanation
Section 7.3
Section 7.4.5
Section 7.4.6
Section 7.4.7
Section 7.4.1
Section 7.4.3
"MR-JE-_C Servo
Amplifier Instruction
Manual (Profile
Mode)"/"MR-JE-_C
Servo Amplifier
Instruction Manual
(Positioning Mode)"
Response Message