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OVERVIEW
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(2) Supporting slave function of MODBUS/TCP communication
The QJ71MT91 supports the slave function of MODBUS/TCP communication,
which is an open network system for factory automation, and it is compatible with
various MODBUS/TCP master devices (hereafter abbreviated to the masters) of
other manufacturers.
The slave function supports the following two functions.
(a) Automatic response function
The QJ71MT91 can automatically respond to a request message received
from the master.
A sequence program for the slave function is not needed.
(b) MODBUS device assignment function
Using MODBUS device assignment parameters, the MODBUS devices are
correlated with the programmable controller CPU device memory.
This enables direct access from the master to the programmable controller
CPU device memory.
Supporting the MODBUS devices of large capacity, the QJ71MT91 allows
all device memory areas of the programmable controller CPU to be
assigned.
MELSEC-Q
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