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OVERVIEW
1 - 4
(3) Concurrent operation of master and slave functions
The master and slave functions can be operated concurrently.
This enables flexible construction of a MODBUS/TCP communication-based
system.
(a) Example of communication between QJ71MT91 and devices
of other companies
Third party
programmable controller
(Master)
Master
Ethernet
1) In response to a request message from the master, the QJ71MT91
operates as a slave and returns a response message.
2) The QJ71MT91 operates as a master, and issues a request message
to the slave.
(b) Example of communication between QJ71MT91 and
QJ71MT91
The both functions can be operated bi-directionally between QJ71MT91
and QJ71MT91.
QJ71MT91
(Master/slave function)
Ethernet
(4) Support of GX Developer connection via Ethernet
GX Developer can be connected to Ethernet via the QJ71MT91.
This enables the maintenance of the programmable controller CPU via Ethernet.
GX Developer
QJ71MT91
(Master/slave function)
Request
message
Response
message
1)
Slave
Master
QJ71MT91
(Master/slave function)
Request
message
Response
message
MELSEC-Q
Third party remote I/O
(Slave)
Request
message
Response
message
2)
Slave
Ethernet
QJ71MT91
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