Mitsubishi Electric QJ71DN91, User Manual

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MELSEC-Q
4 FUNCTIONS
4.2 Master Function (Message Communication Function)
The QJ71DN91 can read or write attribute data of slave nodes using its own buffer
memory.
For details of other message communications, refer to DeviceNet Common Service
in DeviceNet Specifications (Release 2.0).
At one time, 240 bytes of message data can be transferred.
For the execution timing, refer to Section 3.3.2 (3).
(1) Get Attribute
Programmable controller CPU QJ71DN91 Slave node (MAC ID)
SET Y12
X02
FROM
Message Comm.
Request
1)
2)
6)
Message
Comm.
Command area
0110
H
011F
H
5)
3)
TO
2)
X05
X02
FROM
X05
Message
Comm.
Result area
0120
H
012F
H
Message
Comm.
Data area
0130
H
01A7
H
Message
communication
complete
Message Comm.
Completion
Class
Attribute
Instance
Class
4)
Attribute
Instance
Attribute
Instance
Attribute
Instance
Attribute
Attribute
Attribute
*: In DeviceNet, the areas used for reading and writing by communication
are specified by the numbers such as class ID, instance ID, and attribute
ID. For details, refer to the manual of each slave node.
1) Set command data in Message Communication Command (address:
0110
H
to 011F
H
).
2) Set Message Communication Request (Y12) to on to read out attribute
data from the slave that is specified in the command data.
3) The attribute data of the slave node are stored in Message
Communication Data (address: 0130
H
to 01A7
H
).
4) Upon completion of reading, the processing result is stored in
Message Communication Result (address: 0120
H
to 012F
H
), and
Message Communication Completion (X02) is set to on.
5) The slave node’s attribute data stored in Message Communication
Data (address: 0130
H
to 01A7
H
) are read out to the programmable
controller CPU.
6) If failed, Message Communication Error Signal (X05) is set to on.
Read data in Message Communication Result (address: 0120
H
to
012F
H
) to identify the cause of the error.