Overview; Features - Mitsubishi Electric QJ71MT91 User Manual

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OVERVIEW

1 OVERVIEW
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1.1 Features

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This manual explains the specifications, functions, programming, troubleshooting, and
others of the MELSEC-Q series QJ71MT91 MODBUS/TCP interface module
(hereafter abbreviated to the QJ71MT91).
The QJ71MT91 is used to connect the MELSEC-Q series programmable controller to
a MODBUS/TCP network.
(1) Supporting master function of MODBUS/TCP communication
The QJ71MT91 supports the master function of MODBUS/TCP communication,
which is an open network system for factory automation, and it is compatible with
various MODBUS/TCP slave devices (hereafter abbreviated to the slaves) of
other manufactures.
The master function supports the following two functions.
(a) Automatic communication function
By setting the automatic communication parameters, MODBUS device data
can be automatically read from or written to the slaves at the specified
intervals using the QJ71MT91 buffer memory. ( 1)
Data can be transferred between the QJ71MT91 buffer memory and
programmable controller CPU device memory by making the auto refresh
setting with the utility package (GX Configurator-MB) or accessing a
intelligent function module device with a sequence program.
1: The MODBUS device indicates the device area of the slave where data can be read/written in response
to a request from the master.
MELSEC-Q
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