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Mitsubishi Electric QJ71DN91 User Manual Page 18

Melsec q series, devicenet master-slave module.
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1 OVERVIEW
1
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(b)
Message communication function (Refer to Section 4.2.)
Using the buffer memory of the QJ71DN91, attribute data can be read from
or written to slave nodes.
For details of other message communications, refer to the DeviceNet
common service in the DeviceNet Specifications (Release2.0).
At one time, 240 bytes of message data can be transferred.
(c)
Creating master function parameters using auto configuration
The QJ71DN91 can detect slave nodes on the network and automatically
create master function parameters.
Since programming steps for setting master function parameters are not
required, steps for the overall sequence program can be reduced.
(2) Operating as a DeviceNet slave node
The QJ71DN91 is compliant with the DeviceNet Specifications (Release2.0) and
can operate as a DeviceNet slave node.
(a)
I/O communication function (Refer to Section 4.3.)
1)
The QJ71DN91 can exchange I/O data with a master node using its
own buffer memory.
It can exchange 128 bytes of inputs and 128 bytes of outputs.
2)
The connection type is polling.
Master node
Transmit
Receive
*1: Performed by automatic refresh or sequence program.
Slave node
QJ71DN91
Programmable controller CPU
I/O Communication
Request
*1
0B00
H
Slave
Function
Receive
Data area
0B3F
H
*1
0C00
H
Slave
Function
Transmit
Data area
0C3F
H
MELSEC-Q
SET Y11
X
Y
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