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5
FUNCTIONS
5 FUNCTIONS
This chapter explains the functions of the QJ71MT91.
5.1 Function List
The function list of the QJ71MT91 is indicated below.
Function
Automatic communication
Master function
( 4)
Dedicated instruction ( 1)
Automatic response
function( 2)
Slave function
MODBUS device
assignment function( 3)
KeepAlive function
Ethernet function
Router relay function
IEEE 802.3 frame
Redundant system function
GX Developer connection function
QJ71MT91 status check function
Hardware test
Self-loopback test
5 - 1
Description
Automatically issues device read/write request
messages from the master (QJ71MT91) to the
MODBUS/TCP-compatible slave device.
Allows reading/writing of the MODBUS device at any
timing with a sequence program.
Automatically performs the processing corresponding to
the function code in the request message received from
the master, and automatically sends a response
message.
Automatically converts access from the slave
(QJ71MT91) to the MODBUS device into access to the
programmable controller CPU device. Users can assign
it as desired.
This enables direct access from the MODBUS/TCP-
compatible master device to the programmable
controller CPU device memory.
Confirms the status of communication with the target
device where a TCP connection has been established.
When communication is not made for a given period of
time between the QJ71MT91 and the open target
device, the QJ71MT91 checks the target device for
existence and cuts off unnecessary TCP connections.
Exchanges data with the device connected to other
Ethernet via router(s) and/or gateway(s).
(This is not a function with which the QJ71MT91
operates as a router.)
Allows connection with the device that uses the IEEE
802.3 frame.
A network can be configured in a redundant system.
Allows connection of up to eight GX Developers via the
QJ71MT91.
Checks the operations of the QJ71MT91 and
send/receive functions.
Tests the RAM and ROM of the QJ71MT91.
Tests the send/receive functions and hardware of the
QJ71MT91.
MELSEC-Q
Reference
Section
5.2.1
Chapter 10
Section
5.3.1
5
Section
5.3.2
Section 5.4
Section 5.5
Section 6.6
( 5)
Section 5.6
Section
6.5.1
Section
6.5.2
5 - 1
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