Overview; Features - Mitsubishi Electric QJ71DN91 User Manual

1 OVERVIEW

1 OVERVIEW
This manual provides descriptions such as the specifications and parts names of the
QJ71DN91 DeviceNet master/slave module, which is used in combination with a
MELSEC-Q series programmable controller CPU.
For the DeviceNet specifications, refer to the DeviceNet Specifications (Release 2.0)
Volumes 1 and 2.
DeviceNet is a registered trademark of Open DeviceNet Vendor Association, Inc.
The QJ71DN91 is assumed to be compatible with most of DeviceNet products on
the market. However, the compatibility with products manufactured by other
vendors is not guaranteed.

1.1 Features

This section explains the features of the QJ71DN91.
(1) Operating as a DeviceNet master node
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POINT
The QJ71DN91 is compliant with the DeviceNet Specifications (Release2.0) and
can operate as a master node.
(a) I/O communication function (Refer to Section 4.1.)
1) The QJ71DN91 can exchange I/O data with slave nodes (max. 63
nodes) using its own buffer memory.
Communications of 512 bytes of inputs (up to 256 bytes per node) and
512 bytes of outputs (up to 256 bytes per node) are available.
Master node
Programmable controller CPU
SET Y11
X
Y
*1: Performed by automatic refresh or sequence program.
2) One of the following connection types can be selected for each slave
node.
• Polling
• Bit strobe
• Change of state
• Cyclic
QJ71DN91
I/O Communication
Request
*1
0700
H
Master
Function
Receive
Data area
07FF
H
*1
0900
H
Master
Function
Transmit
Data area
09FF
H
MELSEC-Q
1
Slave node
Transmit
Receive
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